{"id":1938,"date":"2023-12-21T12:24:07","date_gmt":"2023-12-21T06:54:07","guid":{"rendered":"https:\/\/envisionmathanswerkey.com\/?p=1938"},"modified":"2023-12-22T14:28:35","modified_gmt":"2023-12-22T08:58:35","slug":"envision-math-common-core-grade-1-answer-key-topic-1","status":"publish","type":"post","link":"https:\/\/envisionmathanswerkey.com\/envision-math-common-core-grade-1-answer-key-topic-1\/","title":{"rendered":"enVision Math Common Core Grade 1 Answer Key Topic 1 Understand Addition and Subtraction"},"content":{"rendered":"

Go through the\u00a0enVision Math Common Core Grade 1 Answer Key<\/a>\u00a0Topic 1 Understand Addition and Subtraction<\/strong>\u00a0regularly and improve your accuracy in solving questions.<\/p>\n

enVision Math Common Core 1st Grade Answers Key Topic 1 Understand Addition and Subtraction<\/h2>\n

Essential Question:<\/strong><\/p>\n

What are ways to think about addition and subtraction?<\/p>\n

Look at the adult and baby giraffes.<\/p>\n

How are they the same? How are they different?<\/p>\n

\"Envision<\/p>\n

Wow! Let’s do this project and learn more.<\/p>\n

envision STEM Project: Parents and Babies<\/p>\n

Find Out Talk to friends and relatives about different animals and their babies.
\nAsk them how the parents and babies are the same and how they are different.<\/p>\n

Journal: Make a Book Show what you found.
\nIn your book, also:<\/p>\n

    \n
  • Draw some animals, including the parents and babies.<\/li>\n
  • Create and solve addition and subtraction stories about some animals and their babies.<\/li>\n<\/ul>\n

    Review What You Know
    \n<\/strong>Vocabulary<\/strong><\/p>\n

    Question 1.
    \nCount the fish. Write the number that tells how many.
    \n\"Envision
    \nAnswer:
    \nNumber of fishes given in the picture = 5 or Five.
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Vocabulary-1\"<\/p>\n

    Explanation:
    \nNumber of fishes given in the picture = 5 or Five.<\/p>\n

     <\/p>\n

    \"Understand<\/p>\n

    Question 2.
    \nJoin the two groups and write how many.
    \n\"Envision
    \nAnswer:
    \nTotal number of apples in the figure = 4 or Four.
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Vocabulary-2\"<\/p>\n

    Explanation:
    \nNumber of black apples in the figure = 2 or Two.
    \nNumber of grey apples in the figure = 2 or Two.
    \nTotal number of apples in the figure = Number of black apples in the figure + Number of grey apples in the figure
    \n= 2 + 2
    \n= 4 or Four.<\/p>\n

     <\/p>\n

    Question 3.
    \nWrite how many soccer balls there are in all.
    \n\"Envision
    \nAnswer:
    \nTotal number of balls in the figure = 4 or Four.
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Vocabulary-3\"<\/p>\n

    Explanation:
    \nNumber of foot balls in the figure = 3 or Three.
    \nNumber of tennis balls in the figure =1 or One.
    \nTotal number of balls in the figure = Number of foot balls in the figure + Number of tennis balls in the figure
    \n= 3 + 1
    \n= 4 or Four.<\/p>\n

     <\/p>\n

    Counting
    \n<\/strong>Question 4.
    \nTammy has 4 balloons. Draw a picture of her balloons.
    \nAnswer:
    \nNumber of balloons Tammy has = 4 or Four.
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Vocabulary-4\"<\/p>\n

    Explanation:
    \nNumber of balloons Tammy has = 4 or Four.<\/p>\n

     <\/p>\n

    Question 5.
    \nWrite the number that tells how many cats.
    \n\"Envision
    \nAnswer:
    \nNumber of cats in the given picture = 3 or Three.
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Vocabulary-5\"<\/p>\n

    Explanation:
    \nNumber of cats in the given picture = 3 or Three.<\/p>\n

     <\/p>\n

    Sums
    \n<\/strong>Question 6.
    \nCircle the number that shows how many crabs you see.
    \n\"Envision
    \nAnswer:
    \nNumber of crabs in the given picture = 3 or Three.
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Vocabulary-Sums-6\"<\/p>\n

    Explanation:
    \nNumber of crabs in the given picture = 3 or Three.
    \nNumber of scorpions in the given picture = 2 or Two.<\/p>\n

    \"Understand<\/p>\n

     <\/p>\n

    Pick a Project
    \n<\/strong>Project 1A<\/p>\n

    Where do birds lay their eggs?
    \nProject: Draw a bird Clutch
    \n\"Envision
    \nAnswer:
    \nBirds lay their Eggs in their nests.<\/p>\n

    Explanation:
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Vocabulary-Sums-Project<\/p>\n

     <\/p>\n

    Project 1B
    \nWhat is the most popular fruit juice in the world?
    \nProject: Find Fruit Facts
    \n\"Envision
    \nAnswer:
    \nThe most popular fruit juice in the world\u00a0 is orange juice.<\/p>\n

    Explanation:
    \nThe most popular fruit juice in the world\u00a0 is orange juice.
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Vocabulary-Sums-Project<\/p>\n

    Project 1C
    \nWhat are different homes made of?
    \nProject: Build a model
    \n\"Envision<\/p>\n

    Answer:
    \nMany houses are now\u00a0made\u00a0with steel frames put together with rivets and bolts.<\/p>\n

    Explanation:
    \nGenerally houses are made of steel , iron, mud ,clay ,stones , cement.
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Vocabulary-Sums-Project<\/p>\n

    <\/h3>\n

    <\/h3>\n

    Lesson 1.1 Add To
    \nSolve and Share<\/h3>\n

    4 dogs
    \nSome dogs join.
    \nHow many dogs now?
    \nShow how you solve.
    \n\"Envision
    \n_______ dogs now
    \nAnswer:
    \nTotal number of dogs = 8 or Eight.
    \n___8____ dogs now.
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

    Explanation:
    \nNumber of dogs given in the picture = 4 or Four.
    \nNumber of dogs joined more = 4 or Four.
    \nTotal number of dogs = Number of dogs given in the picture\u00a0 + Number of dogs joined more
    \n= 4 + 4
    \n= 8 or Eight.<\/p>\n

    \"Understand<\/p>\n

    Visual Learning Bridge<\/strong><\/p>\n

    \"Envision<\/p>\n

    Convince Me!
    \n<\/strong>How do cubes help you solve the problem?
    \nAnswer:
    \nCubes helps to solve the problem easier in counting.<\/p>\n

    Explanation:
    \nCubes helps to solve the problem easier in counting without any confusion.<\/p>\n

    \"Envision<\/p>\n

     <\/p>\n

     <\/p>\n

    Guided Practice
    \n<\/strong>Solve. Use cubes to help.<\/p>\n

    Question 1.
    \n3 cows
    \n\"Envision
    \n3 cows join.
    \n\"Envision
    \nHow many cows now?
    \n\"Envision<\/p>\n

    Answer:
    \nTotal number of cows now = 6 or Six.
    \n\"Envision<\/p>\n

    Explanation:
    \nNumber of cows in the given picture = 3 or Three.
    \nNumber of cows more joined = 3 or Three.
    \nTotal number of cows now = Number of cows in the given picture + Number of cows more joined
    \n= 3 + 3
    \n= 6 or Six.
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson\u00a0 \u00a0 \"Envision<\/p>\n

    \"Understand<\/p>\n

     <\/p>\n

    Question 2.
    \n2 birds
    \n\"Envision
    \n6 birds join.
    \n\"Envision
    \nHow many birds now?
    \n\"Envision<\/p>\n

    Answer:
    \nTotal number of birds now = 8 or Eight.
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

    Explanation:
    \nNumber of birds in the given picture = 2 or Two.
    \nNumber of birds more joined = 6 or Six.
    \nTotal number of birds now = Number of birds in the given picture + Number of birds more joined
    \n= 2 + 6
    \n= 8 or Eight.
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

     <\/p>\n

     <\/p>\n

    Question 3.
    \n4 bees
    \n\"Envision
    \n4 bees join
    \n\"Envision
    \nHow many bees now?
    \n\"Envision
    \nAnswer:
    \nTotal number of bees now = 8 or Eight.
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

    Explanation:
    \nNumber of bees in the given picture = 4 or Four.
    \nNumber of bees more joined = 4 or Four.
    \nTotal number of bees now = Number of bees in the given picture + Number of bees more joined
    \n= 4 + 4
    \n= 8 or Eight.
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

     <\/p>\n

    Question 4.
    \n3 bugs
    \n\"Envision
    \n6 bugs join.
    \n\"Envision
    \nHow many bugs now?
    \n\"Envision
    \nAnswer:
    \nTotal number of bugs now = 9 or Nine.
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

    Explanation:
    \nNumber of bugs in the given picture = 3 or Three.
    \nNumber of bugs more joined = 6 or Six.
    \nTotal number of bugs now = Number of bugs in the given picture + Number of bugs more joined
    \n= 3 + 6
    \n= 9 or Nine.<\/p>\n

     <\/p>\n

    Solve the problem.<\/strong>
    \nDraw a picture to help.<\/p>\n

    Question 5.
    \nHigher Order Thinking<\/strong>
    \n6 ducks
    \n4 chickens
    \n2 ducks join.
    \nHow many ducks in all?
    \n_____ ducks in all.
    \nAnswer:
    \nTotal number of ducks now in all = 8 or Eight.
    \n__8___ ducks in all.<\/p>\n

    Explanation:
    \nNumber of ducks\u00a0 given = 6 or Six.
    \nNumber of chickens given = 4 or Four.
    \nNumber of ducks more joined = 2 or Two.
    \nTotal number of ducks now in all = Number of ducks given + Number of ducks more joined
    \n= 6 + 2
    \n= 8 or Eight.<\/p>\n

    \"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson1
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

    Problem Solving<\/strong>
    \nSolve each problem.<\/p>\n

    Question 6.
    \nVocabulary
    \n3 dogs
    \n4 dogs join.
    \nAdd to find the sum.
    \n\"Envision
    \nAnswer:
    \nTotal number of dogs now in all = 7 or Seven.
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

    Explanation:
    \nNumber of dogs given = 3 or Three.
    \nNumber of dogs more joined = 4 or Four.
    \nTotal number of dogs now in all = Number of dogs given + Number of dogs more joined
    \n= 3 + 4
    \n= 7 or Seven.<\/p>\n

     <\/p>\n

    Question 7.
    \nModel<\/strong>
    \n8 cats
    \n1 cat joins.
    \nHow many cats now?
    \n\"Envision
    \nAnswer:
    \nTotal number of cats now in all = 9 or Nine.
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

    Explanation:
    \nNumber of cats given in the picture = 8 or Eight.
    \nNumber of cats more joined = 1 or One.
    \nTotal number of cats now in all = Number of cats given in the picture + Number of cats more joined
    \n= 8 + 1
    \n= 9 or Nine.
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

     <\/p>\n

    Question 8.
    \nHigher Order Thinking<\/strong>
    \nMake up an addition story about the birds.
    \n\"Envision
    \nAnswer:
    \nThere are 3 birds on a tree sitting. Later 1 bird joined them. How many birds are in all.
    \nTotal number of birds in all now = 4 or Four.
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

    Explanation:
    \nNumber of birds sitting on tree = 3 or Three.
    \nNumber of birds joined later = 1 or One.
    \nTotal number of birds in all now = Number of birds sitting on tree + Number of birds joined later
    \n= 3 + 1
    \n= 4 or Four.<\/p>\n

     <\/p>\n

     <\/p>\n

    Question 9.
    \nAssessment Practice<\/strong><\/p>\n

    5 frogs
    \n\"Envision
    \n3 frogs join
    \n\"Envision
    \nHow many frogs now?
    \nA. 5 + 1 = 6 frogs
    \nB. 5 + 2 = 7 frogs
    \nC. 5 + 3 = 8 frogs
    \nD. 5 + 4 = 9 frogs
    \nAnswer:
    \nTotal number of frogs now in all = 8 or Eight.
    \nC. 5 + 3 = 8 frogs.<\/p>\n

    Explanation:
    \nNumber of frogs given = 5 or Five.
    \nNumber of frogs more joined = 3 or Three.
    \nTotal number of frogs now in all = Number of frogs given + Number of frogs more joined
    \n= 5 + 3
    \n= 8 or Eight.
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

     <\/p>\n

     <\/p>\n

    Lesson 1.2 Put Together<\/h3>\n

    4 red apples and 4 green apples How many apples in all?
    \nShow how you solve.
    \nUse cubes to help.
    \n\"Envision<\/p>\n

    ___ apples in all
    \nAnswer:
    \nTotal number of apples now in all = 8 or Eight.
    \n_8__ apples in all.<\/p>\n

    Explanation:
    \nNumber of red apples = 4 or Four.
    \nNumber of green apples = 4 or Four.
    \nTotal number of apples now in all = Number of red apples + Number of green apples
    \n= 4 + 4
    \n= 8 or Eight.
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

     <\/p>\n

    Visual Learning Bridge<\/strong><\/p>\n

    \"Envision<\/p>\n

    Convince Me!<\/strong><\/p>\n

    Use cubes.
    \nshow 4 + 2.
    \nThen show 2 + 4.
    \nWhat do you notice?
    \nAnswer:
    \nSum of 4 + 2 = ??
    \n4 + 2 = 6 or Six.
    \nSum of 2 + 4 = ??
    \n2 + 4 = 6 or Six.<\/p>\n

    It is noticed the sum of (4 + 2) is same as (2 + 4) = 6 or Six.<\/p>\n

    Explanation:
    \nSum of 4 + 2 = ??
    \n4 + 2 = 6 or Six.
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson
    \nSum of 2 + 4 = ??
    \n2 + 4 = 6 or Six.
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

     <\/p>\n


    \nGuided Practice
    \n<\/strong>Solve. Use cubes to help. Write an addition equation.<\/p>\n

    Question 1.
    \n3 yellow birds and 5 blue birds
    \n\"Envision
    \nHow many birds in all?
    \n\"Envision
    \nAnswer:
    \nTotal number of birds in all = 8 or Eight.
    \n\"Envision<\/p>\n

    Explanation:
    \nNumber of yellow birds = 3 or Three.
    \nNumber of blue birds = 5 or Five.
    \nTotal number of birds in all = Number of yellow birds + Number of blue birds
    \n= 3 + 5
    \n= 8 or Eight.
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

     <\/p>\n

    Question 2.
    \n1 white egg and 6 blue eggs
    \n\"Envision
    \nHow many eggs in all?
    \n\"Envision
    \nAnswer:
    \nTotal number of eggs in all = 7 or Seven.
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

    Explanation:
    \nNumber of white eggs = 1 or One.
    \nNumber of blue eggs = 6 or Six.
    \nTotal number of eggs in all = Number of white eggs + Number of blue eggs
    \n= 1 + 6
    \n= 7 or Seven.
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n


    \nIndependent Practice
    \n<\/strong>Solve. Use cubes or draw a picture. Write an addition equation.<\/p>\n

    Question 3.
    \n3 little pigs and 4 big pigs
    \n\"Envision
    \nHow many pigs in all?
    \n\"Envision
    \nAnswer:
    \nTotal number of pigs in all = 7 or Seven.
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

    Explanation:
    \nNumber of little pigs = 3 or Three.
    \nNumber of big pigs = 4 or Four.
    \nTotal number of pigs in all = Number of little pigs + Number of big pigs
    \n= 3 + 4
    \n= 7 or Seven.
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

     <\/p>\n

     <\/p>\n

    Question 4.
    \n3 box cars and 3 tank cars
    \n\"Envision
    \nHow many cars in all?
    \n\"Envision
    \nAnswer:
    \nTotal number of cars in all = 6 or Six.
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

    Explanation:
    \nNumber of box cars = 3 or Three.
    \nNumber of tank cars = 3 or Three.
    \nTotal number of cars in all = Number of box cars + Number of tank cars
    \n= 3 + 3
    \n= 6 or Six.
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

     <\/p>\n

     <\/p>\n

     <\/p>\n

    Question 5.
    \nHigher Order Thinking<\/strong>
    \n2 red hats
    \n3 shoes
    \n7 blue hats
    \nHow many hats in all?
    \nDraw a picture.
    \nWrite an addition equation.
    \n\"Envision
    \nAnswer:
    \nTotal number of hats in all = 9 or Nine.
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

    Explanation:
    \nNumber of red hats = 2 or Two.
    \nNumber of shoes = 3 or Three.
    \nNumber of blue hats = 7 or Seven.
    \nTotal number of hats in all = Number of red hats + Number of blue hats
    \n= 2 + 7
    \n= 9 or Nine.
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

     <\/p>\n


    \nProblem Solving
    \n<\/strong>Solve each problem.
    \nQuestion 6.
    \nMake Sense<\/strong>
    \nJen has 2 red flowers and 5 blue flowers. How many flowers in all? Write an equation.
    \n\"Envision
    \nAnswer:
    \nTotal number of flowers Jen has in all = 7 or Seven.
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

    Explanation:
    \nNumber of red flowers Jen has = 2 or Two.
    \nNumber of blue flowers Jen has = 5 or Five.
    \nTotal number of flowers Jen has in all = Number of red flowers Jen has + Number of blue flowers Jen has
    \n= 2 + 5
    \n= 7 or Seven.<\/p>\n

     <\/p>\n

     <\/p>\n

    Question 7.
    \nHigher Order Thinking<\/strong>
    \nWrite a picture story. Show blue fish and green fish. Write an addition equation. Tell how many fish in all.
    \n\"Envision
    \nAnswer:
    \nThere are 2 blue fishes in a tank. 2 green fishes were added into the tank. How many fishes are all in the tank.
    \nTotal number of fishes all in the tank = 4 or Four.
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

    Explanation:
    \nThere are 2 blue fishes in a tank. 2 green fishes were added into the tank. How many fishes are all in the tank.
    \nNumber of blue fishes in the tank = 2 or Two.
    \nNumber of green fishes in the tank = 2 or Two.
    \nTotal number of fishes all in the tank = Number of blue fishes in the tank + Number of green fishes in the tank
    \n= 2 + 2
    \n= 4 or Four.<\/p>\n

     <\/p>\n

    Question 8.
    \nAssessment Practice<\/strong>
    \n4 red apples and 5 green apples
    \n\"Envision
    \nHow many apples in all?
    \n\"Envision
    \nAnswer:
    \nTotal number of\u00a0 apples in all = 9 or Nine.
    \nB. 4 + 5 = 9 apples.<\/p>\n

    Explanation:
    \nNumber of red apples = 4 or Four.
    \nNumber of green apples = 5 or Five.
    \nTotal number of\u00a0 apples in all = Number of red apples + Number of green apples
    \n= 4 + 5
    \n= 9 or Nine.
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

     <\/p>\n

     <\/p>\n

     <\/p>\n

    Lesson 1.3 Both Addends Unknown<\/h3>\n

    Sarah has 5 pencils.
    \nShe puts some in the green cup.
    \nShe puts some in the red cup.
    \nHow many pencils could be in each cup?
    \n\"Envision<\/p>\n

    Answer:
    \nNumber of pencils Sarah puts in green cup = 3 or Three.
    \nNumber of pencils Sarah puts in red cup = 2 or Two.<\/p>\n

    Number of pencils Sarah’s partner puts in green cup = 2 or Two.
    \nNumber of pencils Sarah’s partner puts in red cup = 3 or Three.<\/p>\n

    Answers of both are different.<\/p>\n

    Explanation:
    \nTotal number of pencils Sarah has = 5 or Five.
    \nIF
    \nNumber of pencils Sarah puts in green cup = 3 or Three.
    \nNumber of pencils Sarah puts in red cup = Total number of pencils Sarah has – Number of pencils Sarah puts in green cup
    \n= 5 – 3
    \n= 2 or Two.<\/p>\n

    Total number of pencils Sarah has = 5 or Five.
    \nIF
    \nNumber of pencils Sarah’s partner puts in green cup = 2 or Two.
    \nNumber of pencils Sarah’s partner puts in red cup = Total number of pencils Sarah’s partner has – Number of pencils Sarah’s partner puts in green cup
    \n= 5 – 2
    \n= 3 or Three.<\/p>\n

     <\/p>\n

     <\/p>\n

    Visual Learning Bridge<\/strong><\/p>\n

    \"Envision<\/p>\n

    Convince Me!
    \n<\/strong>With 7 penguins, could 4 be inside the cave, and 4 be outside the cave? Why or why not?
    \nAnswer:
    \nWith 7 penguins, could 4 be inside the cave, and 4 be outside the cave cannot happen because the total number of penguins count does not match, it shows more (4 + 4 = 8 not 7).<\/p>\n

    Explanation:
    \nIt cannot happen because the total number of penguins count does not match, it shows more (4 + 4 = 8 not 7).<\/p>\n

     <\/p>\n

     <\/p>\n

    Guided Practice
    \n<\/strong>How many penguins are inside and outside? Use cubes or draw a picture. Write an equation.
    \nAnswer:
    \nCase:1:
    \nNumber of penguins inside the cave = 4 or Four.
    \nNumber of penguins outside the cave = 3 or Three.
    \nCase:2:
    \nNumber of penguins outside the cave = 4 or Four.
    \nNumber of penguins inside the cave = 3 or Three.<\/p>\n

    Explanation:
    \nCase:1:
    \nNumber of penguins inside the cave = 4 or Four.
    \nNumber of penguins outside the cave = 3 or Three.
    \nTotal number of penguins in all = Number of penguins inside the cave + Number of penguins outside the cave
    \n= 4 + 3
    \n= 7 or Seven.<\/p>\n

    \"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

    Case:2:
    \nNumber of penguins outside the cave = 4 or Four.
    \nNumber of penguins inside the cave = 3 or Three.
    \nTotal number of penguins in all = Number of penguins inside the cave + Number of penguins outside the cave
    \n= 3 + 4
    \n= 7 or Seven.
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

     <\/p>\n

     <\/p>\n

    Question 1.
    \n5 penguins in all
    \n\"Envision
    \nAnswer:
    \nTotal number of penguins in all = Number of penguins inside the cave + Number of penguins outside the cave
    \n= 3 + 2
    \n= 5 or Five.<\/p>\n

    Explanation:
    \nNumber of penguins inside the cave = 3 or Three.
    \nNumber of penguins outside the cave = 2 or Two.
    \nTotal number of penguins in all = Number of penguins inside the cave + Number of penguins outside the cave
    \n= 3 + 2
    \n= 5 or Five.
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

     <\/p>\n

     <\/p>\n

    Question 2.
    \n8 penguins in all
    \n\"Envision
    \nAnswer:
    \nTotal number of penguins in all = Number of penguins inside the cave + Number of penguins outside the cave
    \n= 4 + 4
    \n= 8 or Eight.<\/p>\n

    Explanation:
    \nNumber of penguins inside the cave = 4 or Four.
    \nNumber of penguins outside the cave = 4 or Four.
    \nTotal number of penguins in all = Number of penguins inside the cave + Number of penguins outside the cave
    \n= 4 + 4
    \n= 8 or Eight.
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

     <\/p>\n

     <\/p>\n

     <\/p>\n

    Independent Practice
    \n<\/strong>How many bats are inside and outside? Use cubes or draw a picture. Write an equation.<\/p>\n

    Question 3.
    \n9 bats in all
    \n\"Envision
    \nAnswer:
    \nTotal number of bats in all = Number of bats inside the cave + Number of bats outside the cave
    \n= 5 + 4
    \n= 9 or Nine.<\/p>\n

    Explanation:
    \nNumber of bats inside the cave = 5 or Five.
    \nNumber of bats outside the cave = 4 or Four.
    \nTotal number of bats in all = Number of bats inside the cave + Number of bats outside the cave
    \n= 5 + 4
    \n= 9 or Nine.
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

    Question 4.
    \n8 bats in all
    \n\"Envision
    \nAnswer:
    \nTotal number of bats in all = Number of bats inside the cave + Number of bats outside the cave
    \n= 4 + 4
    \n= 8 or Eight.<\/p>\n

    Explanation:
    \nNumber of bats inside the cave = 4 or Four.
    \nNumber of bats outside the cave = 4 or Four.
    \nTotal number of bats in all = Number of bats inside the cave + Number of bats outside the cave
    \n= 4 + 4
    \n= 8 or Eight.<\/p>\n

    \"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

     <\/p>\n

     <\/p>\n

    Question 5.
    \n5 bats in all
    \n\"Envision
    \nAnswer:
    \nTotal number of bats in all = Number of bats inside the cave + Number of bats outside the cave
    \n= 3 + 2
    \n= 5 or Five.<\/p>\n

    Explanation:
    \nNumber of bats inside the cave = 3 or Three.
    \nNumber of bats outside the cave = 2 or Two.
    \nTotal number of bats in all = Number of bats inside the cave + Number of bats outside the cave
    \n= 3 + 2
    \n= 5 or Five.
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

     <\/p>\n

     <\/p>\n

    Question 6.
    \n4 bats in all
    \n\"Envision
    \nAnswer:
    \nTotal number of bats in all = Number of bats inside the cave + Number of bats outside the cave
    \n= 2 + 2
    \n= 4\u00a0 or Four.<\/p>\n

    Explanation:
    \nNumber of bats inside the cave = 2 or Two.
    \nNumber of bats outside the cave = 2 or Two.
    \nTotal number of bats in all = Number of bats inside the cave + Number of bats outside the cave
    \n= 2 + 2
    \n= 4\u00a0 or Four.
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

     <\/p>\n

    Problem Solving
    \n<\/strong>Solve each problem.<\/p>\n

    Question 7.
    \nenvision\u00ae STEM
    \n8 monkeys in all. Some live in trees. Some live on the ground. Show one way.
    \n\"Envision
    \n\"Envision
    \nAnswer:
    \nTotal number of monkeys in all = Number of monkeys live in trees + Number of monkeys live on the ground
    \n= 4 + 4
    \n= 8 or Eight.<\/p>\n

    Explanation:
    \nNumber of monkeys live in trees = 4 or Four.
    \nNumber of monkeys live on the ground =4 or Four.
    \nTotal number of monkeys in all = Number of monkeys live in trees + Number of monkeys live on the ground
    \n= 4 + 4
    \n= 8 or Eight.<\/p>\n

    \"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

     <\/p>\n

     <\/p>\n

    Question 8.
    \nReasoning<\/strong>
    \nAnna draws 2 cats. She draws 5 more cats. How many cats in all? Write an equation.
    \n\"Envision
    \n\"Envision
    \nAnswer:
    \nTotal number of cats Anna draws in all = 7 or Seven.<\/p>\n

    Explanation:
    \nNumber of cats Anna draws = 2 or Two.
    \nNumber of cats Anna draws more = 5 or Five.
    \nTotal number of cats Anna draws in all = Number of cats Anna draws + Number of cats Anna draws more
    \n= 2 + 5
    \n= 7 or Seven.
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

     <\/p>\n

     <\/p>\n

    Question 9.
    \nHigher Order Thinking<\/strong>
    \nAndy has 10 balls. 1 or 2 balls are inside the toy box. How many balls are outside the toy box? Tell how you know.
    \n\"Envision
    \nAnswer:
    \nTotal number of outside the toy box = 8 or Eight.<\/p>\n

    Explanation:
    \nNumber of balls Andy has = 10 or Ten.
    \nNumber of balls inside the toy box = 2 or Two.
    \nTotal number of outside the toy box = Number of balls Andy has + Number of balls inside the toy box
    \n= 10 – 2
    \n= 8 or Eight.
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

     <\/p>\n

     <\/p>\n

    Question 10.
    \nAssessment Practice<\/strong>
    \n9 birds in all. Some birds are flying. Some birds are in a tree.
    \n\"Envision
    \nWhich shows one way?
    \nA. 4 flying, 3 in a tree
    \nB. 5 flying, 4 in a tree
    \nC. 1 flying, 7 in a tree
    \nD. 8 flying, 2 in a tree
    \nAnswer:
    \nTotal number of birds in all = Number of birds flying + Number of birds in a tree
    \n= 5 + 4
    \n= 9 or Nine.
    \nB. 5 flying, 4 in a tree shows one way.<\/p>\n

    Explanation:
    \nNumber of birds flying = 5 or Five.
    \nNumber of birds in a tree = 4 or Four.
    \nTotal number of birds in all = Number of birds flying + Number of birds in a tree
    \n= 5 + 4
    \n= 9 or Nine.<\/p>\n

    \"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

     <\/p>\n

     <\/p>\n

    Lesson 1.4 Take from<\/h3>\n

    Solve and Share<\/strong><\/p>\n

    There are 6 ducks. Some fly away. How many ducks are left?
    \n\"Envision
    \nAnswer:
    \nNumber of ducks left = 4 or Four.<\/p>\n

    Explanation:
    \nTotal number of ducks = 6 or Six.
    \nNumber of ducks flying away = 2 or Two.
    \nNumber of ducks left = Total number of ducks – Number of ducks flying away
    \n= 6 – 2
    \n= 4 or Four.<\/p>\n

    \"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

     <\/p>\n

     <\/p>\n

    Visual Learning Bridge<\/strong><\/p>\n

    \"Envision<\/p>\n

    Convince Me!<\/strong>
    \nHow do cubes help you solve the problem?
    \nAnswer:
    \nThe cubes strategy is a simple tool that helps in step-by-step calculation of addition or subtraction and to solve the problem asked.<\/p>\n

    Explanation:
    \nThe cubes strategy is a simple tool that helps in step-by-step calculation of addition or subtraction and to solve the problem asked. It helps in easy calculation\u00a0 and to understand the problem and solve it.<\/p>\n

     <\/p>\n

     <\/p>\n

    Guided Practice
    \n<\/strong>Solve. Use cubes to help. Write a subtraction equation.<\/p>\n

    Question 1.
    \nThere are 6 frogs. 2 frogs jump off.
    \n\"Envision
    \nHow many frogs are left?
    \n\"Envision
    \nAnswer:
    \nNumber of frogs are left = 4 or Four.<\/p>\n

    Explanation:
    \nTotal number of frogs in all = 6 or Six.
    \nNumber of frogs jump off = 2 Or Two.
    \nNumber of frogs are left = Total number of frogs in all\u00a0 – Number of frogs jump off
    \n= 6 – 2
    \n= 4 or Four.<\/p>\n

    \"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

     <\/p>\n

     <\/p>\n

    Question 2.
    \nThere are 7 bunnies. 1 bunny hops away.
    \n\"Envision
    \nHow many bunnies are left?
    \n\"Envision
    \nAnswer:
    \nNumber of bunnies are left = 6 or Six.<\/p>\n

    Explanation:
    \nTotal number of bunnies in all = 7 or Seven.
    \nNumber of bunnies hops away = 1 or One.
    \nNumber of bunnies are left = Total number of bunnies in all – Number of bunnies hops away
    \n= 7 – 1
    \n= 6 or Six.
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

     <\/p>\n

     <\/p>\n

    Independent Practice
    \n<\/strong>Solve. Use cubes or draw a picture. Write a subtraction equation.<\/p>\n

    Question 3.
    \nThere are 8 bugs. 4 bugs fly away.
    \n\"Envision
    \nHow many bugs are left?
    \n\"Envision
    \nAnswer:
    \nNumber of bugs are left = 4 or Four.<\/p>\n

    Explanation:
    \nTotal number of bugs in all = 8 or Eight.
    \nNumber of bugs fly away = 4 or Four.
    \nNumber of bugs are left = Total number of bugs in all – Number of bugs fly away
    \n= 8 – 4
    \n= 4 or Four.
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

     <\/p>\n

     <\/p>\n

    Question 4.
    \nThere are 9 cats. 6 cats run away.
    \n\"Envision
    \nHow many cats are left?
    \n\"Envision
    \nAnswer:
    \nNumber of cats are left = 3 or Three.<\/p>\n

    Explanation:
    \nTotal number of cats in all = 9 or Nine.
    \nNumber of cats run away = 6 or Six.
    \nNumber of cats are left = Total number of cats in all – Number of cats run away
    \n= 9 – 6
    \n= 3 or Three.
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

    Question 5.
    \nHigher Order thinking<\/strong>
    \nThere are 7 dogs. Some run away. 3 dogs are left. How many dogs ran away.
    \n\"Envision
    \n____ dogs
    \nAnswer:
    \nNumber of dogs run away = 4 or Four.<\/p>\n

    Explanation:
    \nTotal number of dogs in all = 7 or Seven.
    \nNumber of dogs left = 3 or Three.
    \nNumber of dogs run away = Total number of dogs in all – Number of dogs left
    \n= 7 – 3
    \n= 4 or Four.
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

     <\/p>\n

    Problem Solving
    \nSolve each problem.<\/p>\n

    Question 6.
    \nReasoning<\/strong>
    \nLin has 9 stamps. She gives away 4 stamps. How many stamps are left?
    \n\"Envision
    \nAnswer:
    \nNumber of stamps left with Lin = 5 or Five.<\/p>\n

    Explanation:
    \nTotal number of stamps Lin has in all = 9 or Nine.
    \nNumber of stamps Lin gives away = 4 or Four.
    \nNumber of stamps left with Lin = Total number of stamps Lin has in all – Number of stamps Lin gives away
    \n= 9 – 4
    \n= 5 or Five.
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

     <\/p>\n

    Question 7.
    \nReasoning<\/strong>
    \nGloria has 8 flowers. She gives away 5 flowers. How many flowers are left?
    \n\"Envision
    \nAnswer:
    \nNumber of flowers left with Gloria = 3 or Three.<\/p>\n

    Explanation:
    \nTotal number of flowers Gloria has in all = 8 or Eight.
    \nNumber of flowers Gloria gives away = 5 or Five.
    \nNumber of flowers left with Gloria = Total number of flowers Gloria has in all – Number of flowers Gloria gives away
    \n= 8 – 5
    \n= 3 or Three.
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

     <\/p>\n

    Question 8.
    \nHigher Order Thinking<\/strong>
    \nFind the missing number. Write a subtraction story for the equation.
    \n\"Envision
    \nAnswer:
    \nMrs. Shas has 7 balloons. She gives away 2 balloons. How many balloons are left?
    \nNumber of balloons left with Mrs. Shas = 5 or Five.<\/p>\n

    Explanation:
    \nMrs. Shas has 7 balloons. She gives away 2 balloons. How many balloons are left?
    \nTotal number of balloons Mrs. Shas has in all = 7 or Seven.
    \nNumber of balloons Mrs. Shas gives away = 2 or Two.
    \nNumber of balloons left with Mrs. Shas = Total number of balloons Mrs. Shas has in all – Number of balloons Mrs. Shas gives away
    \n= 7 – 2
    \n= 5 or Five.
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

    Question 9.
    \nAssessment Practice<\/strong>
    \nThere are 8 bees. 6 bees fly away. How many bees are left?
    \n\"Envision
    \nA. 8 – 2 = 6 bees
    \nB. 8 – 7 = 1 bees
    \nC. 7 – 2 = 5 bees
    \nD. 8 – 6 = 2 bees
    \nAnswer:
    \nNumber of bees are left = 2 or Two.
    \nD. 8 – 6 = 2 bees<\/p>\n

    Explanation:
    \nTotal number of bees in all = 8 or Eight.
    \nNumber of bees fly away = 6 or Six.
    \nNumber of bees are left = Total number of bees in all – Number of bees fly away
    \n= 8 – 6
    \n= 2 or Two.
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

    <\/h3>\n

    <\/h3>\n

    Lesson 1.5 Compare Situations<\/h3>\n

    There are 5 red cars and 3 blue cars. Are there more red cars or blue cars? How many more? Show how you know.
    \n\"Envision
    \nAnswer:
    \nThere are 2 red cars more than the blue cars.
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

    Explanation:
    \nNumber of red cars = 5 or Five.
    \nNumber of blue cars = 3 or Three.
    \nDifference = Number of red cars – Number of blue cars
    \n= 5 – 3
    \n= 2 or Two.<\/p>\n

     <\/p>\n

     <\/p>\n

    \"Envision<\/p>\n

    Convince Mel<\/strong>
    \nCan you also add to solve the problem above? Explain.
    \nAnswer:
    \nNo, you can not add to solve the problem because you need to find the difference between the blue hats and orange hats to know how many more.<\/p>\n

    Explanation:
    \nYou need to find the difference between the blue hats and orange hats to know how many more.<\/p>\n

    Guided Practice<\/strong>
    \nUse cubes to help. Write an equation. Then solve.<\/p>\n

    Question 1.
    \n6 yellow frogs 3 green frogs
    \n\"Envision
    \nHow many more yellow frogs than green frogs are there? more yellow frogs
    \n\"Envision
    \nAnswer:
    \nThere are 3 yellow frogs more than the green frogs.<\/p>\n

    Explanation:
    \nNumber of yellow frogs = 6 or Six.
    \nNumber of green frogs = 3 or Three.
    \nDifference = Number of yellow frogs – Number of green frogs
    \n= 6 – 3
    \n= 3 or Three.
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

     <\/p>\n

    Independent Practice
    \n<\/strong>Use cubes or draw a picture. Write an equation. Then solve.<\/p>\n

    Question 2.
    \n3 brown dogs I black dog
    \n\"Envision
    \nHow many more brown dogs than black dogs are there?
    \n\"Envision
    \n____ more brown dogs
    \nAnswer:
    \nThere are 2 brown dogs more than the black dogs.
    \n_2__ more brown dogs.<\/p>\n

    Explanation:
    \nNumber of brown dogs = 3 or Three.
    \nNumber of black dogs = 1 or One.
    \nDifference = Number of brown dogs – Number of black dogs
    \n= 3 – 1
    \n= 2 or Two.
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

    Question 3.
    \n7 red beads 4 green beads
    \n\"Envision
    \nHow many more red beads than green beads are there?
    \n\"Envision
    \n___ more red beads
    \nAnswer:
    \nThere are 3 red beads more than the green beads.<\/p>\n

    Explanation:
    \nNumber of red beads= 7 or Seven.
    \nNumber of green beads = 4 or Four.
    \nDifference = Number of red beads – Number of green beads
    \n= 7 – 4
    \n= 3 or Three.
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

     <\/p>\n

    Higher Order Thinking<\/strong><\/p>\n

    There are more blue birds than yellow birds. Write 2 equations to show. Then solve.<\/p>\n

    \"Envision<\/p>\n

    Question 4.
    \n\"Envision
    \nAnswer:
    \nEquation:1:
    \nDifference = Number of blue birds – Number of yellow birds
    \n= 5 – 3
    \n= 2 or Two.<\/p>\n

    Equation:2:
    \nNumber of blue birds\u00a0 = Number of birds flu away + Number of yellow birds
    \n= 2 + 3
    \n= 5 or Five.<\/p>\n

    Explanation:
    \nEquation:1:
    \nNumber of blue birds = 5 or Five.
    \nNumber of yellow birds = 3 or Three.
    \nDifference = Number of blue birds – Number of yellow birds
    \n= 5 – 3
    \n= 2 or Two.<\/p>\n

    Equation:2:
    \nNumber of birds flu away = 2 or Two.
    \nNumber of yellow birds = 3 or Three.
    \nNumber of blue birds\u00a0 = Number of birds flu away + Number of yellow birds
    \n= 2 + 3
    \n= 5 or Five.<\/p>\n

    \"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

     <\/p>\n

    Problem Solving
    \nSolve each problem. Use cubes or draw a picture.<\/p>\n

    Question 5.
    \nNumber Sense 4 fish are in a tank. 2 fish are sold. How many fish are left?
    \n\"Envision
    \nAnswer:
    \nNumber of fishes left in the tank = 2 or Two.<\/p>\n

    Explanation:
    \nNumber of fishes in a tank = 4 or Four.
    \nNumber of fishes sold = 2 or Two.
    \nNumber of fishes left in the tank = Number of fishes in a tank – Number of fishes sold
    \n= 4 – 2
    \n= 2 or Two.
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

     <\/p>\n

    Question 6.
    \nModel<\/strong>
    \nLuis sees 5 green frogs. He sees I blue frog. How many more green frogs than blue frogs does Luis see?
    \n\"Envision
    \n___ more green frogs
    \nAnswer:
    \nThere are 4 green frogs seen by Luis more than the blue frogs seen by her.
    \n_4__ more green frogs.<\/p>\n

    Explanation:
    \nNumber of green frogs Luis sees = 5 or Five.
    \nNumber of blue frogs Luis sees = 1 or One.
    \nDifference = Number of green frogs Luis sees – Number of blue frogs Luis sees
    \n= 5 – 1
    \n= 4 or Four.<\/p>\n

     <\/p>\n

    Question 7.
    \nHigher Order Thinking<\/strong>
    \nDraw some yellow flowers. Draw more red flowers than yellow flowers. How many more red flowers than yellow flowers are there?
    \n\"Envision
    \nAnswer:
    \nThere are 2 red flowers more than the yellow flowers.<\/p>\n

    Explanation:
    \nNumber of red flowers = 6 or Six.
    \nNumber of yellow flowers = 4 or Four.
    \nDifference = Number of red flowers – Number of yellow flowers
    \n= 6 – 4
    \n= 2 or Two.
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

     <\/p>\n

    Question 8.
    \nAssessment Practice<\/strong>
    \n6 gray cats
    \n4 white cats
    \nHow many more gray cats than white cats are there?
    \nA. 2 more gray cats
    \nB. 4 more gray cats
    \nC. 6 more gray cats
    \nD. 10 more gray cats
    \n\"Envision
    \nAnswer:
    \nThere are 2 gray cats more than the white cats.
    \nA. 2 more gray cats<\/p>\n

    Explanation:
    \nNumber of gray cats = 6 or Six.
    \nNumber of white cats = 4 or Four.
    \nDifference = Number of gray cats – Number of white cats
    \n= 6 – 4
    \n= 2 or Two.
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

     <\/p>\n

     <\/p>\n

     <\/p>\n

    Lesson 1.6 More Compare Situations<\/h3>\n

    \"Envision
    \nAmy has 7 stickers. Tim has 5 stickers. Who has fewer stickers? How many fewer? Show how you know.
    \nAnswer:
    \nTim has 2 stickers fewer than Amy.<\/p>\n

    Explanation:
    \nNumber of\u00a0 stickers Amy has = 7 or Seven.
    \nNumber of\u00a0 stickers Tim has = 5 or Five.
    \nDifference = Number of\u00a0 stickers Amy has – Number of\u00a0 stickers Tim has
    \n= 7 – 5
    \n= 2 or Two.
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

     <\/p>\n

     <\/p>\n

     <\/p>\n

    Visual Learning Bridge<\/strong>
    \n\"Envision<\/p>\n

    Convince Me!<\/strong><\/p>\n

    How is finding how many fewer like finding how many more?
    \nAnswer:
    \nFinding how many fewer is same like finding how many more because the process is to find how much and how many.<\/p>\n

    Explanation:
    \nFinding how many fewer is same like finding how many more because the process is to find how much and how many. They are just in difference of calculation terms one is adding and other is subtracting.<\/p>\n

     <\/p>\n

    Guided Practice
    \n<\/strong>Use cubes to help. Write an equation. Then solve.<\/p>\n

    Question 1.
    \nJuan has 8 red crayons. Sue has 2 blue crayons.
    \n\"Envision
    \nHow many fewer crayons does Sue have than Juan?
    \n\"Envision
    \nAnswer:
    \n6 fewer crayons Sue has than Juan has.<\/p>\n

    Explanation:
    \nNumber of\u00a0 red crayons Juan has = 8 or Eight.
    \nNumber of\u00a0 blue crayons Sue has = 2 or Two,.
    \nDifference = Number of red crayons Juan has – Number of blue crayons Sue has
    \n= 8 – 2
    \n= 6 or Six.
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

     <\/p>\n

    Question 2.
    \nAnn has 4 purple grapes. Sam has 7 green grapes.
    \n\"Envision
    \nHow many fewer grapes does Ann have than Sam?
    \n\"Envision
    \nAnswer:
    \n3 fewer grapes Ann have than Sam.<\/p>\n

    Explanation:
    \nNumber of purple grapes Ann has = 4 or Four.
    \nNumber of green grapes Sam has = 7 or Seven,.
    \nDifference = Number of green grapes Sam has – Number of purple grapes Ann has
    \n= 7 – 4
    \n= 3 or Three.
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

     <\/p>\n

    Independent Practice
    \n<\/strong>Use cubes or draw a picture. Write an equation. Then solve.<\/p>\n

    Question 3.
    \nEmma buys 10 red apples. She buys 5 green apples.
    \n\"Envision
    \nHow many fewer green apples than red apples does Emma buy?
    \n\"Envision
    \nAnswer:
    \n5 fewer green apples than red apples Emma buys.<\/p>\n

    Explanation:
    \nNumber of red apples Emma buys = 10 or Ten.
    \nNumber of green apples Emma buys = 5 or Five.
    \nDifference = Number of red apples Emma buys – Number of green apples Emma buys
    \n= 10 – 5
    \n= 5 or Five.
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

     <\/p>\n

    Question 4.
    \nBeth writes on 3 cards. Joe writes on 9 cards.
    \n\"Envision
    \nHow many fewer cards does Beth write on than Joe?
    \n\"Envision
    \nAnswer:
    \n6 fewer cards Beth writes on than Joe.<\/p>\n

    Explanation:
    \nNumber of cards Beth writes = 3 or Three.
    \nNumber of cards Joe writes = 9 or Nine.
    \nDifference = Number of cards Joe writes – Number of cards Beth writes
    \n= 9 – 3
    \n= 6 or Six.
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

     <\/p>\n

     <\/p>\n

    Question 5.
    \nHigher Order Thinking<\/strong>
    \nThere are fewer white kites than blue kites. Write 2 equations to show. Then solve.
    \n\"Envision
    \nAnswer:
    \nEquation:1:
    \nDifference = Number of blue kites – Number of white kites
    \n= 13 – 8
    \n= 5 or Five.<\/p>\n

    Equation:2:
    \nNumber of white kites = Number of blue kites + Difference between the white and blue kites
    \n= 8 + 5
    \n= 13 or Thirteen.<\/p>\n

    Explanation:
    \nEquation:1:
    \nNumber of white kites = 8 or Eight.
    \nNumber of blue kites = 13 or Thirteen.
    \nDifference = Number of blue kites – Number of white kites
    \n= 13 – 8
    \n= 5 or Five.<\/p>\n

    Equation:2:
    \nNumber of white kites = ??
    \nNumber of blue kites = 13 or Thirteen.
    \nDifference between the white and blue kites = 5 or Five.
    \nNumber of white kites = Number of blue kites + Difference between the white and blue kites
    \n= 8 + 5
    \n= 13 or Thirteen.
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

    Problem Solving
    \n<\/strong>Question 6.
    \nReasoning<\/strong>
    \nLeah has 3 pens. Scott has 6 pens. How many pens do they have in all?
    \n\"Envision
    \nAnswer:
    \nTotal number of pens they have in all = 9 or Nine.<\/p>\n

    Explanation:
    \nNumber of pens Leah has = 3 or Three.
    \nNumber of pens Scott has = 6 or Six.
    \nTotal number of pens they have in all = Number of pens Leah has + Number of pens Scott has
    \n= 3 + 6
    \n= 9 or Nine.
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

     <\/p>\n

     <\/p>\n

    Question 7.
    \nReasoning<\/strong>
    \nThere are 7 oranges on a branch. 3 oranges fall off.
    \n\"Envision
    \nHow many oranges are left?
    \n\"Envision
    \nAnswer:
    \nNumber of oranges left = 4 or Four.<\/p>\n

    Explanation:
    \nNumber of oranges on a branch = 7 or Seven
    \nNumber of oranges fell off = 3 or Three.
    \nNumber of oranges left = Number of oranges on a branch – Number of oranges fell off
    \n= 7 – 3
    \n= 4 or Four.
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

     <\/p>\n

     <\/p>\n

    Question 8.
    \nHigher Order Thinking<\/strong>
    \nDraw some blue balloons. Draw fewer yellow balloons. How many fewer yellow balloons than blue balloons are there?
    \n\"Envision
    \nAnswer:
    \nThere are 2 fewer yellow balloons than blue balloons.<\/p>\n

    Explanation:
    \nNumber of blue balloons = 5 or Five.
    \nNumber of yellow balloons = 3 or Three.
    \nDifference =\u00a0 Number of blue balloons – Number of yellow balloons
    \n= 5 – 3
    \n= 2 or Two.
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

     <\/p>\n

     <\/p>\n

    Question 9.
    \nAssessment Practice<\/strong>
    \n8 apple trees
    \n6 pear trees
    \nHow many fewer pear trees than apple trees are there?
    \nA. 2 fewer pear trees
    \nB. 3 fewer pear trees
    \nC. 6 fewer pear trees
    \nD. 8 fewer pear trees
    \nAnswer:
    \nThere are 2 fewer pear trees than apple trees.
    \nA. 2 fewer pear trees<\/p>\n

    Explanation:
    \nNumber of apple trees = 8 or eight.
    \nNumber of \u00a0pear trees = 6 or Six.
    \nDifference =\u00a0 Number of apple trees – Number of \u00a0pear trees
    \n= 8 – 6
    \n= 2 or Two.
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

     <\/p>\n

    Lesson 1.7 Change Unknown<\/h3>\n

    Solve and Share<\/strong><\/p>\n

    There are 5 train cars. More train cars join. Now there are 9 train cars. How many train cars joined?
    \n\"Envision
    \n__ trains cars joined.
    \nAnswer:
    \nNumber of trains cars joined = 4 or Four.
    \n__4__ trains cars joined.<\/p>\n

    Explanation:
    \nNumber of train cars = 5 or Five.
    \nNumber of train cars now = 9 or nine.
    \nNumber of trains cars joined = Number of train cars now – Number of train cars
    \n= 9 – 5
    \n= 4 or Four.
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

     <\/p>\n

    Visual Learning Bridge<\/strong>
    \n\"Envision<\/p>\n

    Convince Me!<\/strong><\/p>\n

    Can you also subtract to solve the problem above? Explain.
    \nAnswer:
    \nYes, you can subtract to solve the problem above.
    \nNumber of cars = 5 or Five
    \nNumber of cars now = 9 or Nine.
    \nNumber of cars came more = Number of cars now – Number of cars
    \n= 9 – 5
    \n= 4 or Four.<\/p>\n

    Explanation:
    \nNumber of cars = 5 or Five
    \nNumber of cars now = 9 or Nine.
    \nDifference:
    \nNumber of cars came more = Number of cars now – Number of cars
    \n= 9 – 5
    \n= 4 or Four.
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

     <\/p>\n

    Guided Practice
    \n<\/strong>Use cubes to help. Write an equation. Then solve.<\/p>\n

    Question 1.
    \nBobby has 4 fish.
    \n\"Envision
    \nHe buys more fish. Now he has 7 fish. How many fish did Bobby buy?
    \n\"Envision
    \nAnswer:
    \nNumber of fishes Bobby buys = 3 or Three.<\/p>\n

    Explanation:
    \nNumber of fishes\u00a0Bobby has = 4 or Four.
    \nNumber of fishes Bobby has now = 7 or seven.
    \nNumber of fishes Bobby buys = Number of fishes Bobby has now – Number of fishes\u00a0Bobby has
    \n= 7 – 4
    \n= 3 or Three.
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

     <\/p>\n

    Independent Practice<\/strong><\/p>\n

    Use cubes or draw a picture. Write an equation. Then solve.<\/p>\n

    Question 2.
    \nMary has 4 stickers.
    \n\"Envision
    \nPat gives her more stickers. Now Mary has 8 stickers. How many stickers did Pat give Mary?
    \n\"Envision
    \nAnswer:
    \nNumber of stickers Pat gives her more = 4 or Four.<\/p>\n

    Explanation:
    \nNumber of stickers Mary has = 4 or Four.
    \nNumber of stickers Mary has now = 8 or Eight.
    \nNumber of stickers Pat gives her more = Number of stickers Mary has now – Number of stickers Mary has
    \n= 8 – 4
    \n= 4 or Four.
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

     <\/p>\n

     <\/p>\n

    Question 3.
    \nBilly draws 4 red cars.
    \n\"Envision
    \nThen he draws some blue cars. Now there are 10 cars. How many blue cars did Billy draw?
    \n\"Envision
    \nAnswer:
    \nNumber of blue cars Billy draws = 6 or Six.<\/p>\n

    Explanation:
    \nNumber of red cars Billy draws = 4 or Four.
    \nNumber of cars Billy has now = 10 or Ten.
    \nNumber of blue cars Billy draws = Number of cars Billy has now – Number of red cars Billy draws
    \n= 10 – 4
    \n= 6 or Six.
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

     <\/p>\n

    Question 4.
    \nHigher Order Thinking<\/strong>
    \nSome girls are on the bus. 2 boys get on the bus. Now there are 7 children on the bus. How many girls are on the bus? Write 2 equations to show. Then solve.
    \n\"Envision
    \nAnswer:
    \nEquation:1:
    \nNumber of girls are on the bus = Number of children on the bus now – Number of boys get on the bus
    \n= 7 – 2
    \n= 5 or Five.<\/p>\n

    Equation:2:
    \nNumber of children on the bus now = Number of boys get on the bus + Number of girls are on the bus
    \n=> 7 = 2 + Number of girls are on the bus
    \n=> 7 – 2 = Number of girls are on the bus
    \n=> 5 or Five = Number of girls are on the bus.<\/p>\n

    Explanation:
    \nEquation:1:
    \nNumber of boys get on the bus = 2 or Two.
    \nNumber of children on the bus now =7 or Seven.
    \nNumber of girls are on the bus = Number of children on the bus now – Number of boys get on the bus
    \n= 7 – 2
    \n= 5 or Five.<\/p>\n

    Equation:2:
    \nNumber of children on the bus now =7 or Seven.
    \nNumber of boys get on the bus = 2 or Two.
    \nNumber of girls are on the bus = ??
    \nNumber of children on the bus now = Number of boys get on the bus + Number of girls are on the bus
    \n=> 7 = 2 + Number of girls are on the bus
    \n=> 7 – 2 = Number of girls are on the bus
    \n=> 5 = Number of girls are on the bus.
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

     <\/p>\n

    Problem Solving
    \n<\/strong>Solve each problem.<\/p>\n

    Question 5.
    \n6 pencils are on the desk.
    \n\"Envision
    \nBob adds more pencils. Now there are 9 pencils. How many pencils did Bob add?
    \nAnswer:
    \nNumber of pencils Bob added more = 3 or Three.<\/p>\n

    Explanation:
    \nNumber of pencils are on the desk = 6 or Six.
    \nNumber of pencils now = 9 or Nine.
    \nNumber of pencils Bob added more = Number of pencils now – Number of pencils are on the desk
    \n= 9 – 6
    \n= 3 or Three.
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

     <\/p>\n

    Question 6.
    \nUse Tools<\/strong>
    \nNora has 3 pretzels and 7 crackers. How many snacks does she have in all?
    \n\"Envision
    \nAnswer:
    \nNumber of snacks Nora has in all = 10 or Ten.<\/p>\n

    Explanation:
    \nNumber of pretzels Nora has = 3 or Three.
    \nNumber of crackers Nora has = 7 or Seven.
    \nNumber of snacks Nora has in all = Number of pretzels Nora has + Number of crackers Nora has
    \n= 3 + 7
    \n= 10 or Ten.
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

    Question 7.
    \nHigher Order Thinking<\/strong>
    \nSome yellow birds are in a tree. Some blue birds join them. Now there are 5 birds in the tree. How many yellow birds and blue birds could there be?
    \n\"Envision
    \n___ yellow birds and _____ blue birds
    \nAnswer:
    \nCase:1: _2__ yellow birds and _3____ blue birds
    \nTotal number of birds in a tree = Number of yellow birds in a tree + Number of blue birds joined them
    \n= 2 + 3
    \n= 5 or Five.<\/p>\n

    Case:2: __3__ yellow birds and __2___ blue birds
    \nTotal number of birds in a tree = Number of yellow birds in a tree + Number of blue birds joined them
    \n= 3 + 2
    \n= 5 or Five.<\/p>\n

    Explanation:
    \nCase:1:
    \nNumber of yellow birds in a tree = 2 or Two.
    \nNumber of blue birds joined them = 3 or Three.
    \nTotal number of birds in a tree = Number of yellow birds in a tree + Number of blue birds joined them
    \n= 2 + 3
    \n= 5 or Five.<\/p>\n

    Case:2:
    \nNumber of yellow birds in a tree= 3 or Three.
    \nNumber of blue birds joined them \u00a0= 2 or Two.
    \nTotal number of birds in a tree = Number of yellow birds in a tree + Number of blue birds joined them
    \n= 3 + 2
    \n= 5 or Five.
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

     <\/p>\n

    Question 8.
    \nAssessment Practice<\/strong>
    \n4 puppies play. More puppies join them. Now there are 7 puppies. How many puppies joined?
    \nA. 5 puppies
    \nB. 4 puppies
    \nC. 3 puppies
    \nD. 2 puppies
    \nAnswer:
    \nTotal number of puppies joined = 3 or Three.
    \nC. 3 puppies<\/p>\n

    Explanation:
    \nNumber of puppies play = 4 or Four.
    \nNumber of puppies now\u00a0 = 7 or Seven.
    \nTotal number of puppies joined = Number of puppies now + Number of puppies play
    \n= 7 – 4
    \n= 3 or Three.
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

     <\/p>\n

     <\/p>\n

    Lesson 1.8 Practice Adding and Subtracting<\/h3>\n

    Solve & Share<\/strong><\/p>\n

    5 pebbles are brown. The other pebbles are black. There are 7 pebbles in all. How many black pebbles are there?
    \n\"Envision<\/p>\n

    Answer:
    \nNumber of black pebbles = 2 or Two.<\/p>\n

    Explanation:
    \nNumber of brown pebbles = 5 or Five.
    \nNumber of pebbles in all = 7 or Seven.
    \nNumber of black pebbles =\u00a0 Number of pebbles in all – Number of brown pebbles
    \n= 7 – 5
    \n= 2 or Two.
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

     <\/p>\n

    Visual Learning Bridge<\/strong>
    \n\"Envision<\/p>\n

    Convince Me!<\/strong>
    \nCompare the addition and subtraction equations. What do you notice about the numbers?<\/p>\n

    Answer:
    \nIts noticed that both the addition equation and subtraction equation results of finding the girls strength are same.<\/p>\n

    Explanation:
    \nAddition equation:
    \nNumber of boys in the class = 5 or Five.
    \nTotal number of students in the class = 8 or Eight.
    \nNumber of girls in the class + Number of boys in the class = Total number of students in the class
    \n=> ?? + 5 = 8.
    \n=> 3 + 5 = 8<\/p>\n

    Subtraction equation:
    \nNumber of boys in the class = 5 or Five.
    \nTotal number of students in the class = 8 or Eight.
    \nNumber of girls in the class = Total number of students in the class – Number of boys in the class
    \n= 8 – 5
    \n= 3 or Three.<\/p>\n

     <\/p>\n

    Guided Practice
    \n<\/strong>Use cubes to help.
    \nWrite an equation. Then solve.<\/p>\n

    Question 1.
    \nNick has 9 robots. 3 of the robots can talk.
    \n\"Envision
    \nHow many robots cannot talk?
    \n\"Envision
    \nAnswer:
    \nNumber of robots cannot walk = 6 or Six.<\/p>\n

    Explanation:
    \nNumber of robots Nick has = 9 or Nine.
    \nNumber of robots can walk = 3 or Three.
    \nNumber of robots Nick has = Number of robots can walk + Number of robots cannot walk
    \n=> 9 = 3 + ??
    \n=> 9 = 3 + 6
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

    Question 2.
    \n6 children play at the beach. 2 children are girls.
    \n\"Envision
    \nHow many are boys?
    \n\"Envision
    \nAnswer:
    \nNumber of boys playing at the beach = 4 or Four.<\/p>\n

    Explanation:
    \nNumber of girls playing at the beach = 2 or Two.
    \nTotal number of children playing at the beach = 6 or Six.
    \nNumber of boys playing at the beach = Total number of children playing at the beach – Number of girls playing at the beach
    \n= 6 – 2
    \n= 4 or Four.
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

     <\/p>\n

     <\/p>\n

    Independent Practice
    \n<\/strong>Use cubes or draw a picture. Write an equation. Then solve.<\/p>\n

    Question 3.
    \nJill has 9 cards. 5 cards are soccer cards.
    \n\"Envision
    \nThe rest are baseball cards. How many baseball cards are there?
    \n\"Envision
    \n___ baseball cards
    \nAnswer:
    \nNumber of baseball cards = 4 or Four.
    \n__4__ baseball cards.<\/p>\n

    Explanation:
    \nTotal number of cards Jill has = 9\u00a0 or Nine.
    \nNumber of soccer cards = 5 or Five.
    \nNumber of baseball cards = Total number of cards Jill has – Number of soccer cards
    \n= 9 – 5
    \n= 4 or Four.
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

     <\/p>\n

     <\/p>\n

    Question 4.
    \nRita has 7 Shells.
    \n\"Envision
    \n3 shells are big. The rest are small. How many small shells does Rita have?
    \n\"Envision
    \n__ small shells
    \nAnswer:
    \nNumber of shells are small = 4 or Four.
    \n_4_ small shells.<\/p>\n

    Explanation:
    \nNumber of shells are big = 3 or Three.
    \nTotal number of shells Rita has = 7 or Seven.
    \nNumber of shells are small = Total number of shells Rita has – Number of shells are big
    \n= 7 – 3
    \n= 4 or Four.
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

     <\/p>\n

     <\/p>\n

    Question 5.
    \nHigher Order Thinking<\/strong>
    \nHenry has 6 candles on his cake. I candle is green. The rest are blue. How many blue candles are there? Write 2 equations to show. Then solve.
    \n\"Envision
    \nAnswer:
    \nEquation:1:
    \nNumber of blue candles = Total number of candles on Henry cake – Number of green candles
    \n= 6 – 1
    \n= 5 or five.<\/p>\n

    Equation:2:
    \nNumber of green candles\u00a0 + Number of blue candles = Total number of candles on Henry cake
    \n=> 1 + ?? = 6
    \n=> 1 + 5 = 6.<\/p>\n

    Number of blue candles = 5 or five.<\/p>\n

    Explanation:
    \nEquation:1:
    \nNumber of green candles = 1 or One.
    \nTotal number of candles on Henry cake = 6 or Six.
    \nNumber of blue candles = Total number of candles on Henry cake – Number of green candles
    \n= 6 – 1
    \n= 5 or five.<\/p>\n

    Equation:2:
    \nNumber of green candles = 1 or One.
    \nTotal number of candles on Henry cake = 6 or Six.
    \nNumber of green candles\u00a0 + Number of blue candles = Total number of candles on Henry cake
    \n=> 1 + ?? = 6
    \n=> 1 + 5 = 6.
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

     <\/p>\n

     <\/p>\n

    Problem Solving
    \n<\/strong>Solve each problem.<\/p>\n

    Question 6.
    \nMake Sense<\/strong>
    \nJoe buys 2 red fish. He buys some blue fish. He buys 9 fish in all. How many blue fish does Joe buy?
    \n\"Envision
    \n____ blue fish
    \nAnswer:
    \nNumber of blue fishes Joe buys = 7 or Seven.
    \n__7__ blue fish.<\/p>\n

    Explanation:
    \nNumber of red fishes Joe buys = 2\u00a0 or Two.
    \nTotal number of fishes Joe buys in all\u00a0 = 9 or Nine.
    \nNumber of blue fishes Joe buys = Total number of fishes Joe buys in all – Number of red fishes Joe buys
    \n= 9 – 2
    \n= 7 or Seven.
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

     <\/p>\n

    Question 7.
    \nMake Sense<\/strong>
    \nRachel has 8 nickels. She gives away 4 nickels. How many nickels are left?
    \n\"Envision
    \n__ nickels
    \nAnswer:
    \nNumber of nickels left = 4 or Four.
    \n__4__ nickels.<\/p>\n

    Explanation:
    \nNumber of nickels Rachel gives away = 4 or Four.
    \nTotal number of nickels Rachel has in all\u00a0 = 8 or Eight.
    \nNumber of nickels left = Total number of nickels Rachel has in all\u00a0 – Number of nickels Rachel gives away
    \n= 8 – 4
    \n= 4 or Four.
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

    Question 8.
    \nHigher Order Thinking<\/strong>
    \nNina has 8 stuffed animals. Some are bears. Some are tigers. How many of each animal could Nina have?
    \n\"Envision
    \n__ bears and __ tigers
    \nAnswer:
    \nNina can have 4 bears and 4 tigers each.
    \n_4_ bears and _4_ tigers.<\/p>\n

    Explanation:
    \nTotal number of stuffed animals Nina has = 8 or Eight.
    \nNumber of bears + Number of tigers = Total\u00a0 number of stuffed animals Nina has
    \n=> ?? + ?? = 8
    \n=> 4 + 4 = 8.
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

    Question 9.
    \nAssessment Practice<\/strong>
    \nLiz and Mary have 7 fish in all. Liz has 2 fish. How many fish does Mary have? Which equation matches the story?
    \nA. 9 – 2 = 7 fish
    \nB. 7 – 1 = 6 fish
    \nC. 7 – 2 = 5 fish
    \nD. 8 – 7 = 1 fish
    \n\"Envision
    \nAnswer:
    \nNumber of fishes Mary has = 5 or Five.
    \nC. 7 – 2 = 5 fish<\/p>\n

    Explanation:
    \nNumber of fishes Liz has = 2 or Two.
    \nNumber of fishes Liz and Mary have in all = 7 or Seven.
    \nNumber of fishes Mary has = Number of fishes Liz and Mary have in all – Number of fishes Liz has
    \n= 7 – 2
    \n= 5 or Five.
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

     <\/p>\n

    Lesson 1.9 Construct Arguments<\/h3>\n

    Do you add or subtract to solve the problem? Tell why. Show how to solve. Use pictures, numbers, or words
    \n\"Envision<\/p>\n

    Answer:
    \nNumber of more rabbits than turtles = 4 or Four.<\/p>\n

    Explanation:
    \nNumber of rabbits = 7 or Seven.
    \nNumber of turtles = 3 or Three.
    \nNumber of more rabbits than turtles = Number of rabbits – Number of turtles
    \n= 7 – 3
    \n= 4 or Four.
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

     <\/p>\n

     <\/p>\n

    Thinking Habits<\/strong>
    \nHow can I use math to explain my work?
    \nIs my explanation clear?
    \n\"Envision
    \nAnswer:
    \nI can use math to explain my work by taking the support of pictures ,diagrams to explain to solve the problem in a simple and easy way.
    \nYes, my is explanation clear.<\/p>\n

    Explanation:
    \nI can use math to explain my work by taking the support of pictures ,diagrams to explain to solve the problem in a simple and easy way.
    \nYes, my is explanation clear because it is simple and easy to understand.<\/p>\n

     <\/p>\n

    Visual Learning Bridge<\/strong>
    \n\"Envision<\/p>\n

    Convince Me!<\/strong><\/p>\n

    Look at the two ways to find the number of red crayons. How are the ways alike? How are the ways different?<\/p>\n

    Answer:
    \nThe two ways to find the number of red crayons are alike because the process is done to find the count how many are red crayons. The ways are different because the process differs as one is addition and other is subtraction.<\/p>\n

    Explanation:
    \nWay:1:
    \nNumber of blue crayons = 6 or Six.
    \nTotal number of crayons in all = 9 or Nine.
    \nNumber of red crayons = Total number of crayons in all – Number of blue crayons
    \n= 9 – 6
    \n= 3 or Three.<\/p>\n

    Way:2:
    \nNumber of blue crayons = 6 or Six.
    \nTotal number of crayons in all = 9 or Nine.
    \nNumber of red crayons + Number of blue crayons = Total number of crayons in all
    \n=> ?? + 6 = 9
    \n=> 3 + 6 = 9.
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

     <\/p>\n

     <\/p>\n

    Guided Practice
    \n<\/strong>Solve. Use pictures, numbers, or words to explain.<\/p>\n

    Question 1.
    \nManny draws 6 tiles. 4 tiles are red. The others are green. How many green tiles does Manny draw?
    \n\"Envision
    \nAnswer:
    \nNumber of green tiles Manny draws = 2 or Two.<\/p>\n

    Explanation:
    \nNumber of tiles Manny draws = 6 or Six.
    \nNumber of red tiles Manny draws = 4 or Four.
    \nNumber of green tiles Manny draws = Number of tiles Manny draws – Number of red tiles
    \n= 6 – 4
    \n= 2 or Two.
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

     <\/p>\n

    Independent Practice
    \n<\/strong>Solve. Use pictures, numbers, or words to explain.<\/p>\n

    Question 2.
    \nJan has 8 pennies. She spends 5 pennies. How many pennies does Jan have left?
    \nAnswer:
    \nNumber of pennies left = 3 or Three.<\/p>\n

    Explanation:
    \nNumber of pennies Jan has = 8 or Eight.
    \nNumber of pennies Jan spends = 5 or Five.
    \nNumber of pennies left = Number of pennies Jan has – Number of pennies Jan spends
    \n= 8 – 5
    \n= 3 or Three.
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

     <\/p>\n

    Question 3.
    \nLidia has 7 pencils. Jon has 2 pencils. Who has fewer pencils? How many fewer?
    \nAnswer:
    \nJon has fewer pencils by 5 or five.<\/p>\n

    Explanation:
    \nNumber of \u00a0pencils Lidia has = 7 or Seven
    \nNumber of pencils Jon has = 2 or Two.
    \nDifference =Number of \u00a0pencils Lidia has – Number of pencils Jon has
    \n= 7 – 2
    \n= 5 or Five.
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

     <\/p>\n

     <\/p>\n

    Question 4.
    \nHigher Order Thinking<\/strong>
    \nMax has 3 apples. He buys 2 more apples. He gives away 4 apples. How many apples does Max have left? Explain.
    \nAnswer:
    \nNumber of apples left = 1 or One.<\/p>\n

    Explanation:
    \nNumber of apples Max has = 3 or Three.
    \nNumber of more apples Max buys = 2 or Two.
    \nTotal number of apples Max has = Number of apples Max has + Number of more apples Max buys
    \n= 3 + 2
    \n= 5 or Five.<\/p>\n

    Number of apples Max gives away = 4 or Four.
    \nNumber of apples left = Total number of apples Max has – Number of apples Max gives away
    \n= 5 – 4
    \n= 1 or One.
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

     <\/p>\n

    Problem Solving
    \n<\/strong>Performance Task
    \n<\/strong>Lemonade Stand<\/strong>
    \nSome friends sell lemonade. Solve each problem. Use pictures, numbers, or words to explain.
    \n\"Envision<\/p>\n

    Question 5.
    \nExplain
    \nAlex sells 3 cups. Mark sells 5 cups. How many cups do they sell in all? Here is Alex\u2019s work.
    \n\"Envision
    \nIs his work correct? Tell why.
    \nAnswer:
    \nTotal number of cups sold in all = 8 or Eight.
    \nHis work is correct has the answer is correct.<\/p>\n

    Explanation:
    \nNumber of cups Alex sells = 3 or Three.
    \nNumber of cups Mark sells = 5 or Five.
    \nTotal number of cups sold in all = Number of cups Alex sells + Number of cups Mark sells
    \n= 3 + 5
    \n= 8 or Eight.
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

     <\/p>\n

     <\/p>\n

    Question 6.
    \nBe Precise<\/strong>
    \nMia sells 2 cups.
    \nGina sells 6 cups.
    \nHow many more cups does Gina sell than Mia?
    \nAnswer:
    \n4 more cups Gina sells than Mia.<\/p>\n

    Explanation:
    \nNumber of cups Mia sells = 2 or Two.
    \nNumber of cups Gina sells = 6 or Six.
    \nDifference =\u00a0Number of cups Gina sells – Number of cups Mia sells
    \n= 6 – 2
    \n= 4 or Four.
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

     <\/p>\n

    Fluency Review Activity<\/h3>\n

    Color these sums and differences. Leave the rest white.
    \n\"Envision
    \nAnswer:
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

    Vocabulary Review<\/strong>
    \nUnderstand Vocabulary<\/p>\n

    Question 1.
    \nWrite an addition equation
    \n\"Envision
    \nAnswer:
    \nAddition equation:
    \n2\u00a0 +\u00a0 2\u00a0 =\u00a0 4.
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

    Explanation:
    \nAddition equation:
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

    Question 2.
    \nWrite a subtraction equation.
    \n\"Envision
    \nAnswer:
    \nSubtraction equation:
    \n8\u00a0 –\u00a0 3\u00a0 =\u00a0 5.
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

    Explanation:
    \nSubtraction equation:
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

     <\/p>\n

    Question 3.
    \nCircle the difference
    \n8 – 2 = 6
    \nAnswer:
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

    Explanation:
    \nDifference:
    \n8 – 2 = 6.<\/p>\n

     <\/p>\n

     <\/p>\n

    Question 4.
    \nCircle one part.
    \n5 + 3 = 8
    \nAnswer:
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

    Explanation:
    \nAddition Equation:
    \n5 + 3 = 8.<\/p>\n

     <\/p>\n

     <\/p>\n

    Question 5.
    \nCircle the plus sign.
    \n3 + 4 = 7
    \nAnswer:
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

    Explanation:
    \nAddition Equation:
    \n3 + 4 = 7.<\/p>\n

     <\/p>\n

    Use Vocabulary in Writing<\/strong><\/p>\n

    Question 6.
    \nTell how to find 8-4. Use at least one word from the Word List.
    \nAnswer:
    \nEight – Four = Four.<\/p>\n

    Explanation:
    \nEight – Four = Four.
    \n8- 4 = 4 or Four.<\/p>\n

     <\/p>\n

    Set A
    \n<\/strong>You can solve problems about adding to.
    \n3 turtles
    \n1 more joins.
    \nHow many turtles now?
    \n\"Envision
    \nAnswer:
    \nNumber of turtles now = 4 or Four.<\/p>\n

    Explanation:
    \nNumber of turtles = 3 or Three.
    \nNumber of turtles more joined = 1 or One.
    \nNumber of turtles now = Number of turtles + Number of turtles more joined
    \n= 3 + 1
    \n= 4 or Four.
    \n\"Envision<\/p>\n

     <\/p>\n

    Solve. Use cubes or draw a picture.<\/strong><\/p>\n

    Question 1.
    \n5 flowers
    \n2 more flowers
    \nHow many flowers now?
    \n\"Envision
    \nAnswer:
    \nNumber of flowers now = 7 or Seven.<\/p>\n

    Explanation:
    \nNumber of flowers = 5 or Five.
    \nNumber of more flowers = 2 or Two.
    \nNumber of flowers now = Number of flowers + Number of more flowers
    \n= 5 + 2
    \n= 7 or Seven.
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

     <\/p>\n

     <\/p>\n

    Set B
    \n<\/strong>You can solve problems about putting together.
    \n3 red markers and 2 blue markers How many markers in all?
    \n\"Envision
    \nAnswer:
    \nNumber of markers in all = 5 or Five.<\/p>\n

    Explanation:
    \nNumber of red markers = 3 or Three.
    \nNumber of blue markers = 2 or Two.
    \nNumber of markers in all = Number of red markers + Number of blue markers
    \n= 3 + 2
    \n= 5 or Five.
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

    Solve. Use cubes or draw a picture.<\/p>\n

    Question 2.
    \n4 red cars and 2 blue cars
    \nHow many cars in all?
    \n\"Envision
    \nAnswer:
    \nNumber of cars in all = 6 or Six.<\/p>\n

    Explanation:
    \nNumber of red cars = 4 or Four.
    \nNumber of blue cars = 2 or Two.
    \nNumber of cars in all = Number of red cars + Number of blue cars
    \n= 4 + 2
    \n= 6 or Six.
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

     <\/p>\n

     <\/p>\n

    Set C
    \n<\/strong>You can solve problems with both addends unknown.
    \n7 penguins in all . Some are inside a cave. Some are outside. Here is one way.
    \n\"Envision<\/p>\n

    Use cubes or draw a picture. Write an equation to solve.
    \nAnswer:
    \nNumber of penguins in all = Number of penguins inside the cave + Number of penguins outside the cave
    \n= 5 + 2
    \n= 7 or Seven.<\/p>\n

    Explanation:
    \nNumber of penguins inside the cave = 2 or Two.
    \nNumber of penguins outside the cave = 5 or Five.
    \nNumber of penguins in all = Number of penguins inside the cave + Number of penguins outside the cave
    \n= 2 + 5
    \n= 7 or Seven.
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

    Question 3.
    \n6 penguins in all Some are inside. Some are outside. Show one way.
    \n\"Envision
    \nAnswer:
    \nNumber of penguins in all = Number of penguins inside the cave + Number of penguins outside the cave
    \n= 2 + 4
    \n= 6 or Six.<\/p>\n

    Explanation:
    \nNumber of penguins inside the cave = 2 or Two.
    \nNumber of penguins outside the cave = 4 or Four.
    \nNumber of penguins in all = Number of penguins inside the cave + Number of penguins outside the cave
    \n= 2 + 4
    \n= 6 or Six.
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

     <\/p>\n

    Question 4.
    \n9 penguins in all Some are inside. Some are outside. Show one way.
    \n\"Envision
    \nAnswer:
    \nNumber of penguins in all = Number of penguins inside the cave + Number of penguins outside the cave
    \n=> 9 = 4 + 5
    \nNumber of penguins inside the cave = 4 or Four.
    \nNumber of penguins outside the cave = 5 or Five.<\/p>\n

    Explanation:
    \nNumber of penguins in all = 9 or Nine.
    \nNumber of penguins inside the cave = 4 or Four.
    \nNumber of penguins outside the cave = 5 or Five.
    \nNumber of penguins in all = Number of penguins inside the cave + Number of penguins outside the cave
    \n=> 9 = 4 + 5<\/p>\n

    \"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

     <\/p>\n

    Set D<\/p>\n

    You can solve problems about taking from.
    \n\"Envision
    \nThere are 6 pears. Mia takes 3 pears away. How many pears are left?
    \n\"Envision
    \nAnswer:
    \nNumber of pears are left = 3 or Three.<\/p>\n

    Explanation:
    \nNumber of pears in all = 6 or Six.
    \nNumber of pears Mia takes away = 3 or Three.
    \nNumber of pears are left = Number of pears in all – Number of pears Mia takes away
    \n= 6 – 3
    \n= 3 or Three.
    \n\"Envision<\/p>\n

     <\/p>\n

    Use cubes or draw a picture. Write an equation and solve.<\/strong><\/p>\n

    Question 5.
    \nThere are 7 carrots.
    \n3 carrots are picked.
    \nHow many carrots are left?
    \n\"Envision
    \nAnswer:
    \nNumber of carrots are left = 4 or Four.<\/p>\n

    Explanation:
    \nNumber of carrots in all = 7 or Seven.
    \nNumber of carrots picked away = 3 or Three.
    \nNumber of carrots are left = Number of carrots in all – Number of carrots picked away
    \n= 7 – 3
    \n= 4 or Four.
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

     <\/p>\n

     <\/p>\n

    Set E
    \n<\/strong>You can solve problems about comparing.
    \n4 blue pens
    \n3 yellow pens
    \nHow many more blue pens than yellow pens are there?
    \n\"Envision<\/p>\n

    Answer:
    \nThere are 1 more blue pens than yellow pens.<\/p>\n

    Explanation:
    \nNumber of yellow pens = 3 or Three.
    \nNumber of blue pens = 4 or Four.
    \nDifference = Number of blue pens – Number of yellow pens
    \n= 4 – 3
    \n= 1 or One.
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

    Use cubes or draw a picture. Write an equation and solve.<\/p>\n

    Question 6.
    \n4 black pens and I red pen
    \nHow many more black pens than red pens?
    \n\"Envision<\/p>\n

    Answer:
    \nThere are 3 more black pens than red pens.<\/p>\n

    Explanation:
    \nNumber of black pens = 4 or Four.
    \nNumber of red pens = 1 or One.
    \nDifference = Number of black pens – Number of red pens
    \n= 4 – 1
    \n= 3 or Three.
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

     <\/p>\n

     <\/p>\n

    Question 7.
    \n3 baseballs and 7 soccer balls
    \nHow many fewer baseballs than soccer balls?
    \n\"Envision
    \nAnswer:
    \n4 fewer baseballs than soccer balls.<\/p>\n

    Explanation:
    \nNumber of baseballs = 3 or Three.
    \nNumber of soccer balls = 7 or Seven.
    \nDifference = Number of soccer balls – Number of baseballs
    \n= 7 – 3
    \n= 4 or Four.
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

     <\/p>\n

     <\/p>\n

    Set F<\/strong><\/p>\n

    You can find a missing addend to solve problems.<\/p>\n

    Ty has 4 grapes.
    \nHe takes some more grapes.
    \nNow he has 9 grapes
    \nHow many grapes did Ty take?
    \n\"Envision<\/p>\n

    Use cubes or draw a picture. Write an equation and solve.
    \nAnswer:
    \nNumber of grapes ty takes more = 5 or Five.<\/p>\n

    Explanation:
    \nNumber of grapes ty has = 4 or Four.
    \nTotal number of grapes ty has = 9 or Nine.
    \nNumber of grapes ty takes more = Total number of grapes ty has – Number of grapes ty has
    \n= 9 – 4
    \n= 5 or Five.
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

     <\/p>\n

    Question 8.
    \nIvy has 2 fish in a bowl. She adds some more fish. Now Ivy has 5 fish. How many fish did she add?
    \n\"Envision
    \nAnswer:
    \nNumber of fishes Ivy has added = 3 or Three.<\/p>\n

    Explanation:
    \nNumber of fishes Ivy has in a bowl = 2 or Two.
    \nTotal number of fishes Ivy has in a bowl = 5 or Five.
    \nNumber of fishes Ivy has added = Total number of fishes Ivy has in a bowl – Number of fishes Ivy has in a bowl
    \n= 5 – 2
    \n= 3 or Three.
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

     <\/p>\n

    Set G
    \n<\/strong>You can add or subtract to find a missing part.<\/p>\n

    Tom has 9 shirts.
    \nHe has 4 red shirts.
    \nThe rest are blue.
    \nHow many blue shirts does Tom have?
    \n\"Envision<\/p>\n

    Use cubes or draw a picture. Write an equation and solve.
    \nAnswer:
    \nNumber of blue shirts Tom has = Total number of shirts Tom has -Number of red shirts Tom has
    \n= 9 – 4
    \n= 5 or Five.<\/p>\n

    Explanation:
    \nTotal number of shirts Tom has = 9 or Nine.
    \nNumber of red shirts Tom has = 4 or Four.
    \nNumber of blue shirts Tom has = Total number of shirts Tom has -Number of red shirts Tom has
    \n= 9 – 4
    \n= 5 or Five.
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

    Question 9.
    \nGigi has 8 pairs of shoes. 4 pairs are tennis shoes. The rest are sandals. How many pairs are sandals?
    \n\"Envision
    \nAnswer:
    \nNumber of pair of sandals Gigi has = 4 or Four.<\/p>\n

    Explanation:
    \nTotal number of pairs of shoes Gigi has = 8 or Eight.
    \nNumber of pairs of tennis shoes Gigi has = 4 or Four.
    \nNumber of pair of sandals Gigi has = Total number of pairs of shoes Gigi has – Number of pairs of tennis shoes Gigi has
    \n= 8 – 4
    \n= 4 or Four.
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

     <\/p>\n

     <\/p>\n

    Set H<\/strong><\/p>\n

    Thinking Habits<\/strong>
    \nConstruct Arguments
    \nHow can I use math to explain my work?
    \nIs my explanation clear?
    \n\"Envision<\/p>\n

    Answer:
    \nYou can use math in easy and simplify the calculations of the problem to explain your work.
    \nYes, your explanation is clear and easy.<\/p>\n

    Explanation:
    \nUsing math helps in making easy calculations and understand to solve the problem in an easy way.<\/p>\n

     <\/p>\n

     <\/p>\n

    Solve. Use pictures, numbers, or words to explain.
    \nQuestion 10.
    \nLuc has 8 fish.
    \nHe gives away 4 fish.
    \nHow many fish does Luc have left?
    \nAnswer:
    \nNumber of fishes Luc has left = 4 or Four.<\/p>\n

    Explanation:
    \nTotal number of fishes Luc has = 8 or Eight.
    \nNumber of fishes Luc gives away = 4 or Four.
    \nNumber of fishes Luc has left = Total number of fishes Luc has – Number of fishes Luc gives away
    \n= 8 – 4
    \n= 4 or Four.
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

     <\/p>\n

     <\/p>\n

    Topic 1 Assessment Practice<\/h3>\n

    Question 1.
    \nThere are 8 penguins.
    \nSome go inside the cave.
    \nSome stay outside.
    \nMatch the number of penguins inside the cave with the number of penguins outside.
    \n\"Envision
    \n\"Envision
    \nAnswer:
    \nNumber of penguins inside the cave = 4 or Four.
    \nNumber of penguins inside the cave = 5 or Five.<\/p>\n

    Explanation:
    \nTotal number of penguins\u00a0 = 8 or Eight.
    \nTotal number of penguins\u00a0 =\u00a0 Number of penguins\u00a0 inside the cave + Number of penguins outside the cave
    \n=> 8 = ?? + ??
    \n=> 8 = 4 + 5
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

     <\/p>\n

    Question 2.
    \nSage had 10 peppers. She cooks 3 of them. How many peppers are left?
    \n\"Envision
    \nWrite a subtraction equation to solve.
    \n\"Envision
    \nAnswer:
    \nNumber of peppers left = 7 or Seven.<\/p>\n

    Explanation:
    \nNumber of peppers Sage had = 10 or Ten.
    \nNumber of peppers Sage had cooked = 3 or Three.
    \nNumber of peppers left = Number of peppers Sage had – Number of peppers Sage had cooked
    \n= 10 – 3
    \n= 7 or Seven.
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

     <\/p>\n

     <\/p>\n

    Question 3.
    \nSara has 5 green beads and 3 red beads. How many beads does she have in all?
    \n\"Envision
    \nWrite an addition equation to solve.
    \n\"Envision
    \nAnswer:
    \nTotal number of beads Sara has in all = 7 or Seven.<\/p>\n

    Explanation:
    \nNumber of beads Sara has = 10 or Ten.
    \nNumber of beads Sara has = 3 or Three.
    \nTotal number of beads Sara has in all\u00a0 = Number of beads Sara has – Number of beads Sara has
    \n= 10 – 3
    \n= 7 or Seven.
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

     <\/p>\n

     <\/p>\n

    Question 4.
    \nTrina has 8 markers. Then she gives 5 markers to David.
    \n\"Envision
    \nWhich equation shows how many markers Trina has left?
    \nA. 7 – 2 = 5
    \nB. 7 – 3 = 4
    \nC. 8 – 5 = 3
    \nD. 9 – 3 = 6
    \nAnswer:
    \nNumber of markers Trina has left = 3 or Three.
    \nC. 8 – 5 = 3<\/p>\n

    Explanation:
    \nTotal number of markers Trina has = 8 or Eight.
    \nNumber of markers given to David = 5 or Five.
    \nNumber of markers Trina has left =Total number of markers Trina has – Number of markers given to David
    \n= 8 – 5
    \n= 3 or Three.
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

     <\/p>\n

     <\/p>\n

    Question 5.
    \nGeorge had 7 postcards. Then he gets some more. Now he has 9 postcards.
    \n\"Envision
    \nWhich equation does NOT describe the story?
    \nA. 7 + 2 = 9
    \nB. 6 + 3 = 9
    \nC. 9 – 7 = 2
    \nD. 9 – 2 = 7
    \nAnswer:
    \nB. 6 + 3 = 9 does NOT describe the story.<\/p>\n

    Explanation:
    \nNumber of postcards George had = 7 or Seven.
    \nTotal number of postcards now he has = 9 or Nine.
    \nEquation: A:
    \nNumber of postcards George had + Number of postcards George gets more\u00a0 = Total number of postcards now he has
    \n=> 7 + 2
    \n= 9 or Nine.<\/p>\n

    Equation: C:
    \nNumber of postcards George gets more = Total number of postcards now he has – Number of postcards George had
    \n= 9 – 7
    \n= 2 or Two.<\/p>\n

    Equation: D:
    \nTotal number of postcards now he has – Number of postcards George gets more = Number of postcards George had
    \n= 9 – 2
    \n= 7 or Seven.
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

     <\/p>\n

     <\/p>\n

    Question 6.
    \nDante has 5 books. He wants to have 7 books. How many more books does Dante need to have 7 in all?
    \n\"Envision<\/p>\n

    Answer:
    \nNumber of books he needs more to have 7 in all = 2 or Two.
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

    Explanation:
    \nNumber of books Dante has = 5 or Five.
    \nNumber of books he want to have = 7 or Seven.
    \nNumber of books he needs more to have 7 in all = Number of books he want to have – Number of books Dante has
    \n= 7 – 5
    \n= 2 or Two.
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

     <\/p>\n

     <\/p>\n

    Question 7.
    \nLucy and Ellie have 6 cubes in all.
    \nEllie has 5 cubes.
    \n\"Envision
    \nHow many cubes does Lucy have?
    \nChoose three equations that show the story.
    \n\"Envision
    \nAnswer:
    \nNumber of cubes Lucy has =\u00a01 or one.
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

    Explanation:
    \nEquation:1:
    \nNumber of cubes Lucy and Ellie have in all = 6 or Six.
    \nNumber of cubes Ellie has = 5 or Five.
    \nNumber of cubes Lucy has = Number of cubes Lucy and Ellie have in all – Number of cubes Ellie has
    \n= 6 – 5
    \n= 1 or one.
    \nEquation:2:
    \nNumber of cubes Lucy and Ellie have in all + Number of cubes Lucy has = Number of cubes Lucy and Ellie have in all
    \n= 5 + 1
    \n= 6 or Six.
    \nEquation:3:
    \nNumber of cubes Lucy and Ellie have in all – Number of cubes Ellie has = Number of cubes Lucy has
    \n= 6-1
    \n= 5 or Five.<\/p>\n

    \"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

     <\/p>\n

    Question 8.
    \nTrina has 6 ribbons. Julie has 2 ribbons. What could happen for them to have the same number of ribbons?
    \nA. Julie gives I of her ribbons to Trina.
    \nB. Trina gives I of her ribbons to Julie.
    \nC. Trina gives 2 of her ribbons to Julie.
    \nD. Trina gives 4 of her ribbons to Julie.
    \n\"Envision
    \nAnswer:
    \nNumber of ribbons them to have the same number = 4 or Four.
    \nD. Trina gives 4 of her ribbons to Julie.<\/p>\n

    Explanation:
    \nNumber of ribbons Trina has = 6 or Six.
    \nNumber of ribbons Julie has = 2 or Two.
    \nNumber of ribbons them to have the same number = Number of ribbons Trina has – Number of ribbons Julie has
    \n= 6 – 2
    \n= 4 or Four.
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

    Question 9.
    \nDraw the missing cubes on the mat.
    \nThen write a subtraction equation that shows the story.
    \nOwen has 5 blocks. He gives I to Jordan.
    \nHow many blocks does Owen have left?
    \n\"Envision
    \n\"Envision<\/p>\n

    Answer:
    \nNumber of blocks Owen have left = 4 or Four.<\/p>\n

    Explanation:
    \nNumber of blocks Owen has = 5 or Five.
    \nNumber of blocks Own gives to Jordan = 1 or One.
    \nNumber of blocks Owen have left = Number of blocks Owen has – Number of blocks Own gives to Jordan
    \n= 5 – 1
    \n= 4 or Four.
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

     <\/p>\n

    Question 10.
    \nHannah has 9 flowers. Carrie has 6 flowers. Which equation shows how many fewer flowers Carrie has than Hannah?
    \n\"Envision
    \n\"Envision
    \nAnswer:
    \nNumber of fewer flowers Carrie has than Hannah = 3 or Three.
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

    Explanation:
    \nNumber of flowers Hannah has = 9 or Nine.
    \nNumber of flowers Carrie has = 6 or Six.
    \nNumber of fewer flowers Carrie has than Hannah = Number of flowers Hannah has – Number of flowers Carrie has
    \n= 9 – 6
    \n= 3 or Three.
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

    Question 11.
    \nLaura has 7 pears.
    \nShe wants to keep 2 pears for herself and give one to each of 6 friends.
    \nWill Laura have enough pears?
    \nUse pictures and words to explain.
    \nAnswer:
    \nLaura is not having enough pears to give to her friends.
    \nNumber of pears left with her are five, which are less to give to her 6 friends each.<\/p>\n

    Explanation:
    \nTotal number of pears Laura has = 7 or Seven.
    \nNumber of pears She wants to keep for herself = 2 or Two.
    \nNumber of pears left =\u00a0 Total number of pears Laura has – Number of pears She wants to keep for herself
    \n= 7 or 2
    \n= 5 or Five.
    \nNumber of pears She give one to each of 6 friends.
    \n=> Number of pears required to be with her to give to her friends = 1 \u00d7 6
    \n=> 6 or Six.
    \nNumber of pears left with her are 5, which are less to give to her friends.
    \nTherefore, Laura does not have enough pears to give to her friends.
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

     <\/p>\n

    Question 12.
    \nNikki has 8 tennis balls. Thomas has 6 tennis balls. Which equation shows how many more tennis Nikki has than Thomas?
    \n\"Envision
    \n\"Envision
    \nAnswer:
    \nNumber of more tennis balls Nikki has than Thomas = 2 or Two.
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

    Explanation:
    \nNumber of tennis balls Nikki has = 8 or Eight
    \nNumber of tennis balls Thomas has = 6 or Six.
    \nNumber of more tennis balls Nikki has than Thomas = Number of tennis balls Nikki has – Number of tennis balls Thomas has
    \n= 8 – 6
    \n= 2 or Two.
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson<\/p>\n

    <\/h3>\n

    Topic 1 Assessment Practice<\/h3>\n

    Skating Ribbons<\/strong>
    \nMarta is an ice skater.
    \nShe wins ribbons for her skating.
    \n\"Envision<\/p>\n

    Question 1.
    \nMarta wins 2 blue ribbons. She wins 4 red ribbons.
    \nHow many ribbons does she win in all?
    \n____ ribbons
    \nAnswer:
    \nNumber of ribbons Marta wins in all = 6 or Six.
    \n_6__ ribbons.<\/p>\n

    Explanation:
    \nNumber of blue ribbons Marta wins = 2 or Two.
    \nNumber of red ribbons Marta wins = 4 or Four.
    \nNumber of ribbons Marta wins in all = Number of blue ribbons Marta wins + Number of red ribbons Marta wins
    \n= 2 + 4
    \n= 6 or Six.
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Topic<\/p>\n

     <\/p>\n

    Question 2.
    \nMarta has 4 red ribbons.
    \nShe wins some more red ribbons.
    \nNow she has 7 red ribbons.
    \nHow many more red ribbons did Marta win? ___ more red ribbons
    \nWrite an equation to show why your answer is correct.
    \nAnswer:
    \n3 more red ribbons Marta wins.
    \n_3__ more red ribbons.<\/p>\n

    Explanation:
    \nNumber of red ribbons Marta has = 4 or Four.
    \nTotal number of red ribbons Marta has now = 7 or Seven.
    \nNumber of red ribbons Marta wins more = Total number of red ribbons Marta has now – Number of red ribbons Marta has
    \n= 7 – 4
    \n= 3 or Three.
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Topic<\/p>\n

     <\/p>\n

     <\/p>\n

    Question 3.
    \nMarta has 8 yellow ribbons. She put some on her door. She puts the rest on her wall.
    \n\"Envision
    \nWrite two different addition equations to show two ways she can put the ribbons on her door or on her wall.
    \nAnswer:
    \nEquation:1:
    \nNumber of yellow ribbons She puts on her door = 4 or Four.
    \nNumber of yellow ribbons She puts on her wall = 4 or Four.<\/p>\n

    Equation:2:
    \nNumber of yellow ribbons She puts on her door = 5 or Five.
    \nNumber of yellow ribbons She puts on her wall = 3 or Three.<\/p>\n

    Explanation:
    \nEquation:1:
    \nNumber of yellow ribbons Marta has = 8 or Eight.
    \nNumber of yellow ribbons Marta has = Number of yellow ribbons She puts on her door + Number of yellow ribbons She puts on her wall
    \n= 4+ 4
    \n= 8 or Eight.<\/p>\n

    Equation:2:
    \nNumber of yellow ribbons Marta has = 8 or Eight.
    \nNumber of yellow ribbons Marta has = Number of yellow ribbons She puts on her door + Number of yellow ribbons She puts on her wall
    \n= 5 + 3
    \n= 8 or Eight.
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Topic<\/p>\n

     <\/p>\n

    Question 4.
    \nMarta has 8 yellow ribbons.
    \nShe has 2 blue ribbons.
    \nHow many more yellow ribbons than blue ribbons does Marta have?
    \n___ more yellow ribbons
    \nAnswer:
    \n6 more yellow ribbons than blue ribbons Marta has.
    \n_6__ more yellow ribbons.<\/p>\n

    Explanation:
    \nNumber of yellow ribbons Marta has = 8 or Eight.
    \nNumber of blue ribbons Marta has = 2 or Two.
    \nDifference = Number of yellow ribbons Marta has – Number of blue ribbons Marta has
    \n= 8 – 2
    \n= 6 or Six.
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Topic<\/p>\n

     <\/p>\n

    Question 5.
    \nExplain why your answer to item 4 is correct. Use numbers, pictures, or words.
    \nAnswer:
    \nMy answer is correct to item 4 because:
    \nDifference of more yellow ribbons than blue ribbons Marta has + Number of blue ribbons Marta has
    \n=> 6 + 2
    \n=> 8 = Number of yellow ribbons Marta has.<\/p>\n

    Explanation:
    \nMy answer is correct to item 4 because:
    \nDifference of more yellow ribbons than blue ribbons Marta has + Number of blue ribbons Marta has
    \n=> 6 + 2
    \n=> 8 = Number of yellow ribbons Marta has.
    \n\"Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Topic<\/p>\n","protected":false},"excerpt":{"rendered":"

    Go through the\u00a0enVision Math Common Core Grade 1 Answer Key\u00a0Topic 1 Understand Addition and Subtraction\u00a0regularly and improve your accuracy in solving questions. enVision Math Common Core 1st Grade Answers Key Topic 1 Understand Addition and Subtraction Essential Question: What are ways to think about addition and subtraction? Look at the adult and baby giraffes. How …<\/p>\n","protected":false},"author":1,"featured_media":25516,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2],"tags":[],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"https:\/\/envisionmathanswerkey.com\/wp-content\/uploads\/2021\/06\/Envision-Math-Common-Core-Grade-1-Answer-Key-Topic-1-Understand-Addition-and-Subtraction.png","_links":{"self":[{"href":"https:\/\/envisionmathanswerkey.com\/wp-json\/wp\/v2\/posts\/1938"}],"collection":[{"href":"https:\/\/envisionmathanswerkey.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/envisionmathanswerkey.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/envisionmathanswerkey.com\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/envisionmathanswerkey.com\/wp-json\/wp\/v2\/comments?post=1938"}],"version-history":[{"count":5,"href":"https:\/\/envisionmathanswerkey.com\/wp-json\/wp\/v2\/posts\/1938\/revisions"}],"predecessor-version":[{"id":28004,"href":"https:\/\/envisionmathanswerkey.com\/wp-json\/wp\/v2\/posts\/1938\/revisions\/28004"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/envisionmathanswerkey.com\/wp-json\/wp\/v2\/media\/25516"}],"wp:attachment":[{"href":"https:\/\/envisionmathanswerkey.com\/wp-json\/wp\/v2\/media?parent=1938"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/envisionmathanswerkey.com\/wp-json\/wp\/v2\/categories?post=1938"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/envisionmathanswerkey.com\/wp-json\/wp\/v2\/tags?post=1938"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}