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 are they the same? How are they different?

Envision Math Common Core 1st Grade Answer Key Topic 1 Understand Addition and Subtraction 100

Wow! Let’s do this project and learn more.

envision STEM Project: Parents and Babies

Find Out Talk to friends and relatives about different animals and their babies.
Ask them how the parents and babies are the same and how they are different.

Journal: Make a Book Show what you found.
In your book, also:

  • Draw some animals, including the parents and babies.
  • Create and solve addition and subtraction stories about some animals and their babies.

Review What You Know
Vocabulary

Question 1.
Count the fish. Write the number that tells how many.
Envision Math Common Core Grade 1 Answer Key Topic 1 Understand Addition and Subtraction 1
Answer:
Number of fishes given in the picture = 5 or Five.
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Vocabulary-1

Explanation:
Number of fishes given in the picture = 5 or Five.

 

Question 2.
Join the two groups and write how many.
Envision Math Common Core Grade 1 Answer Key Topic 1 Understand Addition and Subtraction 2
Answer:
Total number of apples in the figure = 4 or Four.
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Vocabulary-2

Explanation:
Number of black apples in the figure = 2 or Two.
Number of grey apples in the figure = 2 or Two.
Total number of apples in the figure = Number of black apples in the figure + Number of grey apples in the figure
= 2 + 2
= 4 or Four.

 

Question 3.
Write how many soccer balls there are in all.
Envision Math Common Core Grade 1 Answer Key Topic 1 Understand Addition and Subtraction 3
Answer:
Total number of balls in the figure = 4 or Four.
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Vocabulary-3

Explanation:
Number of foot balls in the figure = 3 or Three.
Number of tennis balls in the figure =1 or One.
Total number of balls in the figure = Number of foot balls in the figure + Number of tennis balls in the figure
= 3 + 1
= 4 or Four.

 

Counting
Question 4.
Tammy has 4 balloons. Draw a picture of her balloons.
Answer:
Number of balloons Tammy has = 4 or Four.
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Vocabulary-4

Explanation:
Number of balloons Tammy has = 4 or Four.

 

Question 5.
Write the number that tells how many cats.
Envision Math Common Core Grade 1 Answer Key Topic 1 Understand Addition and Subtraction 4
Answer:
Number of cats in the given picture = 3 or Three.
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Vocabulary-5

Explanation:
Number of cats in the given picture = 3 or Three.

 

Sums
Question 6.
Circle the number that shows how many crabs you see.
Envision Math Common Core Grade 1 Answer Key Topic 1 Understand Addition and Subtraction 5
Answer:
Number of crabs in the given picture = 3 or Three.
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Vocabulary-Sums-6

Explanation:
Number of crabs in the given picture = 3 or Three.
Number of scorpions in the given picture = 2 or Two.

 

 

Pick a Project
Project 1A

Where do birds lay their eggs?
Project: Draw a bird Clutch
Envision Math Common Core Grade 1 Answer Key Topic 1 Understand Addition and Subtraction 6
Answer:
Birds lay their Eggs in their nests.

Explanation:
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Vocabulary-Sums-Project 1A

 

Project 1B
What is the most popular fruit juice in the world?
Project: Find Fruit Facts
Envision Math Common Core Grade 1 Answer Key Topic 1 Understand Addition and Subtraction 7
Answer:
The most popular fruit juice in the world  is orange juice.

Explanation:
The most popular fruit juice in the world  is orange juice.
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Vocabulary-Sums-Project 1B

Project 1C
What are different homes made of?
Project: Build a model
Envision Math Common Core Grade 1 Answer Key Topic 1 Understand Addition and Subtraction 8

Answer:
Many houses are now made with steel frames put together with rivets and bolts.

Explanation:
Generally houses are made of steel , iron, mud ,clay ,stones , cement.
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Vocabulary-Sums-Project 1C

Lesson 1.1 Add To
Solve and Share

4 dogs
Some dogs join.
How many dogs now?
Show how you solve.
Envision Math Common Core Grade 1 Answer Key Topic 1 Understand Addition and Subtraction 20
_______ dogs now
Answer:
Total number of dogs = 8 or Eight.
___8____ dogs now.
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.1 Add To-Solve and Share

Explanation:
Number of dogs given in the picture = 4 or Four.
Number of dogs joined more = 4 or Four.
Total number of dogs = Number of dogs given in the picture  + Number of dogs joined more
= 4 + 4
= 8 or Eight.

 

Visual Learning Bridge

Envision Math Common Core Grade 1 Answer Key Topic 1 Understand Addition and Subtraction 25

Convince Me!
How do cubes help you solve the problem?
Answer:
Cubes helps to solve the problem easier in counting.

Explanation:
Cubes helps to solve the problem easier in counting without any confusion.

Envision Math Common Core Grade 1 Answer Key Topic 1 Understand Addition and Subtraction 25

 

 

Guided Practice
Solve. Use cubes to help.

Question 1.
3 cows
Envision Math Common Core Grade 1 Answer Key Topic 1 Understand Addition and Subtraction 30
3 cows join.
Envision Math Common Core Grade 1 Answer Key Topic 1 Understand Addition and Subtraction 31
How many cows now?
Envision Math Common Core Grade 1 Answer Key Topic 1 Understand Addition and Subtraction 32

Answer:
Total number of cows now = 6 or Six.
Envision Math Common Core Grade 1 Answer Key Topic 1 Understand Addition and Subtraction 32

Explanation:
Number of cows in the given picture = 3 or Three.
Number of cows more joined = 3 or Three.
Total number of cows now = Number of cows in the given picture + Number of cows more joined
= 3 + 3
= 6 or Six.
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.1 Add To-Guided Practice-1    Envision Math Common Core Grade 1 Answer Key Topic 1 Understand Addition and Subtraction 32

 

Question 2.
2 birds
Envision Math Common Core Grade 1 Answer Key Topic 1 Understand Addition and Subtraction 33
6 birds join.
Envision Math Common Core Grade 1 Answer Key Topic 1 Understand Addition and Subtraction 34
How many birds now?
Envision Math Common Core Grade 1 Answer Key Topic 1 Understand Addition and Subtraction 35

Answer:
Total number of birds now = 8 or Eight.
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.1 Add To-Guided Practice-2..

Explanation:
Number of birds in the given picture = 2 or Two.
Number of birds more joined = 6 or Six.
Total number of birds now = Number of birds in the given picture + Number of birds more joined
= 2 + 6
= 8 or Eight.
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.1 Add To-Guided Practice-2

 

 

Question 3.
4 bees
Envision Math Common Core Grade 1 Answer Key Topic 1 Understand Addition and Subtraction 36
4 bees join
Envision Math Common Core Grade 1 Answer Key Topic 1 Understand Addition and Subtraction 37
How many bees now?
Envision Math Common Core Grade 1 Answer Key Topic 1 Understand Addition and Subtraction 38
Answer:
Total number of bees now = 8 or Eight.
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.1 Add To-Guided Practice-3..

Explanation:
Number of bees in the given picture = 4 or Four.
Number of bees more joined = 4 or Four.
Total number of bees now = Number of bees in the given picture + Number of bees more joined
= 4 + 4
= 8 or Eight.
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.1 Add To-Guided Practice-3

 

Question 4.
3 bugs
Envision Math Common Core Grade 1 Answer Key Topic 1 Understand Addition and Subtraction 39
6 bugs join.
Envision Math Common Core Grade 1 Answer Key Topic 1 Understand Addition and Subtraction 40
How many bugs now?
Envision Math Common Core Grade 1 Answer Key Topic 1 Understand Addition and Subtraction 41
Answer:
Total number of bugs now = 9 or Nine.
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.1 Add To-Guided Practice-4

Explanation:
Number of bugs in the given picture = 3 or Three.
Number of bugs more joined = 6 or Six.
Total number of bugs now = Number of bugs in the given picture + Number of bugs more joined
= 3 + 6
= 9 or Nine.

 

Solve the problem.
Draw a picture to help.

Question 5.
Higher Order Thinking
6 ducks
4 chickens
2 ducks join.
How many ducks in all?
_____ ducks in all.
Answer:
Total number of ducks now in all = 8 or Eight.
__8___ ducks in all.

Explanation:
Number of ducks  given = 6 or Six.
Number of chickens given = 4 or Four.
Number of ducks more joined = 2 or Two.
Total number of ducks now in all = Number of ducks given + Number of ducks more joined
= 6 + 2
= 8 or Eight.

Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.1 Add To-Higher Order Thinking-5...1
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.1 Add To-Higher Order Thinking-5

Problem Solving
Solve each problem.

Question 6.
Vocabulary
3 dogs
4 dogs join.
Add to find the sum.
Envision Math Common Core Grade 1 Answer Key Topic 1 Understand Addition and Subtraction 40.1
Answer:
Total number of dogs now in all = 7 or Seven.
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.1 Add To-Problem Solving-6

Explanation:
Number of dogs given = 3 or Three.
Number of dogs more joined = 4 or Four.
Total number of dogs now in all = Number of dogs given + Number of dogs more joined
= 3 + 4
= 7 or Seven.

 

Question 7.
Model
8 cats
1 cat joins.
How many cats now?
Envision Math Common Core Grade 1 Answer Key Topic 1 Understand Addition and Subtraction 41.1
Answer:
Total number of cats now in all = 9 or Nine.
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.1 Add To-Problem Solving-Model-7..

Explanation:
Number of cats given in the picture = 8 or Eight.
Number of cats more joined = 1 or One.
Total number of cats now in all = Number of cats given in the picture + Number of cats more joined
= 8 + 1
= 9 or Nine.
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.1 Add To-Problem Solving-Model-7

 

Question 8.
Higher Order Thinking
Make up an addition story about the birds.
Envision Math Common Core Grade 1 Answer Key Topic 1 Understand Addition and Subtraction 42
Answer:
There are 3 birds on a tree sitting. Later 1 bird joined them. How many birds are in all.
Total number of birds in all now = 4 or Four.
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.1 Add To-Higher Order Thinking-8

Explanation:
Number of birds sitting on tree = 3 or Three.
Number of birds joined later = 1 or One.
Total number of birds in all now = Number of birds sitting on tree + Number of birds joined later
= 3 + 1
= 4 or Four.

 

 

Question 9.
Assessment Practice

5 frogs
Envision Math Common Core Grade 1 Answer Key Topic 1 Understand Addition and Subtraction 43
3 frogs join
Envision Math Common Core Grade 1 Answer Key Topic 1 Understand Addition and Subtraction 43.1
How many frogs now?
A. 5 + 1 = 6 frogs
B. 5 + 2 = 7 frogs
C. 5 + 3 = 8 frogs
D. 5 + 4 = 9 frogs
Answer:
Total number of frogs now in all = 8 or Eight.
C. 5 + 3 = 8 frogs.

Explanation:
Number of frogs given = 5 or Five.
Number of frogs more joined = 3 or Three.
Total number of frogs now in all = Number of frogs given + Number of frogs more joined
= 5 + 3
= 8 or Eight.
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.1 Add To-Assessment Practice-6

 

 

Lesson 1.2 Put Together

4 red apples and 4 green apples How many apples in all?
Show how you solve.
Use cubes to help.
Envision Math Common Core Grade 1 Answer Key Topic 1 Understand Addition and Subtraction 20.1

___ apples in all
Answer:
Total number of apples now in all = 8 or Eight.
_8__ apples in all.

Explanation:
Number of red apples = 4 or Four.
Number of green apples = 4 or Four.
Total number of apples now in all = Number of red apples + Number of green apples
= 4 + 4
= 8 or Eight.
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.2 Put Together

 

Visual Learning Bridge

Envision Math Common Core Grade 1 Answer Key Topic 1 Understand Addition and Subtraction 20.2

Convince Me!

Use cubes.
show 4 + 2.
Then show 2 + 4.
What do you notice?
Answer:
Sum of 4 + 2 = ??
4 + 2 = 6 or Six.
Sum of 2 + 4 = ??
2 + 4 = 6 or Six.

It is noticed the sum of (4 + 2) is same as (2 + 4) = 6 or Six.

Explanation:
Sum of 4 + 2 = ??
4 + 2 = 6 or Six.
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.2 Put Together-Convince Me!
Sum of 2 + 4 = ??
2 + 4 = 6 or Six.
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.2 Put Together-Convince Me.

 


Guided Practice
Solve. Use cubes to help. Write an addition equation.

Question 1.
3 yellow birds and 5 blue birds
Envision Math Common Core Grade 1 Answer Key Topic 1 Understand Addition and Subtraction 20.6
How many birds in all?
Envision Math Common Core Grade 1 Answer Key Topic 1 Understand Addition and Subtraction 20.7
Answer:
Total number of birds in all = 8 or Eight.
Envision Math Common Core Grade 1 Answer Key Topic 1 Understand Addition and Subtraction 20.7

Explanation:
Number of yellow birds = 3 or Three.
Number of blue birds = 5 or Five.
Total number of birds in all = Number of yellow birds + Number of blue birds
= 3 + 5
= 8 or Eight.
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.2 Put Together-Guided Practice-1

 

Question 2.
1 white egg and 6 blue eggs
Envision Math Common Core Grade 1 Answer Key Topic 1 Understand Addition and Subtraction 20.8
How many eggs in all?
Envision Math Common Core Grade 1 Answer Key Topic 1 Understand Addition and Subtraction 20.9
Answer:
Total number of eggs in all = 7 or Seven.
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.2 Put Together-Guided Practice-2..

Explanation:
Number of white eggs = 1 or One.
Number of blue eggs = 6 or Six.
Total number of eggs in all = Number of white eggs + Number of blue eggs
= 1 + 6
= 7 or Seven.
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.2 Put Together-Guided Practice-2


Independent Practice
Solve. Use cubes or draw a picture. Write an addition equation.

Question 3.
3 little pigs and 4 big pigs
Envision Math Common Core Grade 1 Answer Key Topic 1 Understand Addition and Subtraction 30.1
How many pigs in all?
Envision Math Common Core Grade 1 Answer Key Topic 1 Understand Addition and Subtraction 30.2
Answer:
Total number of pigs in all = 7 or Seven.
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.2 Put Together-Guided Practice-3..

Explanation:
Number of little pigs = 3 or Three.
Number of big pigs = 4 or Four.
Total number of pigs in all = Number of little pigs + Number of big pigs
= 3 + 4
= 7 or Seven.
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.2 Put Together-Guided Practice-3

 

 

Question 4.
3 box cars and 3 tank cars
Envision Math Common Core Grade 1 Answer Key Topic 1 Understand Addition and Subtraction 30.3
How many cars in all?
Envision Math Common Core Grade 1 Answer Key Topic 1 Understand Addition and Subtraction 30.4
Answer:
Total number of cars in all = 6 or Six.
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.2 Put Together-Guided Practice-4..

Explanation:
Number of box cars = 3 or Three.
Number of tank cars = 3 or Three.
Total number of cars in all = Number of box cars + Number of tank cars
= 3 + 3
= 6 or Six.
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.2 Put Together-Guided Practice-4

 

 

 

Question 5.
Higher Order Thinking
2 red hats
3 shoes
7 blue hats
How many hats in all?
Draw a picture.
Write an addition equation.
Envision Math Common Core Grade 1 Answer Key Topic 1 Understand Addition and Subtraction 30.5
Answer:
Total number of hats in all = 9 or Nine.
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.2 Put Together-Higher Order Thinking-5..

Explanation:
Number of red hats = 2 or Two.
Number of shoes = 3 or Three.
Number of blue hats = 7 or Seven.
Total number of hats in all = Number of red hats + Number of blue hats
= 2 + 7
= 9 or Nine.
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.2 Put Together-Higher Order Thinking-5

 


Problem Solving
Solve each problem.
Question 6.
Make Sense
Jen has 2 red flowers and 5 blue flowers. How many flowers in all? Write an equation.
Envision Math Common Core Grade 1 Answer Key Topic 1 Understand Addition and Subtraction 30.6
Answer:
Total number of flowers Jen has in all = 7 or Seven.
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.2 Put Together-Problem Solving-Make Sense-6

Explanation:
Number of red flowers Jen has = 2 or Two.
Number of blue flowers Jen has = 5 or Five.
Total number of flowers Jen has in all = Number of red flowers Jen has + Number of blue flowers Jen has
= 2 + 5
= 7 or Seven.

 

 

Question 7.
Higher Order Thinking
Write a picture story. Show blue fish and green fish. Write an addition equation. Tell how many fish in all.
Envision Math Common Core Grade 1 Answer Key Topic 1 Understand Addition and Subtraction 30.7
Answer:
There are 2 blue fishes in a tank. 2 green fishes were added into the tank. How many fishes are all in the tank.
Total number of fishes all in the tank = 4 or Four.
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.2 Put Together-Higher Order Thinking-7

Explanation:
There are 2 blue fishes in a tank. 2 green fishes were added into the tank. How many fishes are all in the tank.
Number of blue fishes in the tank = 2 or Two.
Number of green fishes in the tank = 2 or Two.
Total number of fishes all in the tank = Number of blue fishes in the tank + Number of green fishes in the tank
= 2 + 2
= 4 or Four.

 

Question 8.
Assessment Practice
4 red apples and 5 green apples
Envision Math Common Core Grade 1 Answer Key Topic 1 Understand Addition and Subtraction 30.8
How many apples in all?
Envision Math Common Core Grade 1 Answer Key Topic 1 Understand Addition and Subtraction 30.9
Answer:
Total number of  apples in all = 9 or Nine.
B. 4 + 5 = 9 apples.

Explanation:
Number of red apples = 4 or Four.
Number of green apples = 5 or Five.
Total number of  apples in all = Number of red apples + Number of green apples
= 4 + 5
= 9 or Nine.
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.2 Put Together-Assessment Practice-8

 

 

 

Lesson 1.3 Both Addends Unknown

Sarah has 5 pencils.
She puts some in the green cup.
She puts some in the red cup.
How many pencils could be in each cup?
Envision Math Common Core 1st Grade Answers Topic 1 Understand Addition and Subtraction 40.2

Answer:
Number of pencils Sarah puts in green cup = 3 or Three.
Number of pencils Sarah puts in red cup = 2 or Two.

Number of pencils Sarah’s partner puts in green cup = 2 or Two.
Number of pencils Sarah’s partner puts in red cup = 3 or Three.

Answers of both are different.

Explanation:
Total number of pencils Sarah has = 5 or Five.
IF
Number of pencils Sarah puts in green cup = 3 or Three.
Number of pencils Sarah puts in red cup = Total number of pencils Sarah has – Number of pencils Sarah puts in green cup
= 5 – 3
= 2 or Two.

Total number of pencils Sarah has = 5 or Five.
IF
Number of pencils Sarah’s partner puts in green cup = 2 or Two.
Number 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
= 5 – 2
= 3 or Three.

 

 

Visual Learning Bridge

Envision Math Common Core 1st Grade Answers Topic 1 Understand Addition and Subtraction 40.3

Convince Me!
With 7 penguins, could 4 be inside the cave, and 4 be outside the cave? Why or why not?
Answer:
With 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).

Explanation:
It cannot happen because the total number of penguins count does not match, it shows more (4 + 4 = 8 not 7).

 

 

Guided Practice
How many penguins are inside and outside? Use cubes or draw a picture. Write an equation.
Answer:
Case:1:
Number of penguins inside the cave = 4 or Four.
Number of penguins outside the cave = 3 or Three.
Case:2:
Number of penguins outside the cave = 4 or Four.
Number of penguins inside the cave = 3 or Three.

Explanation:
Case:1:
Number of penguins inside the cave = 4 or Four.
Number of penguins outside the cave = 3 or Three.
Total number of penguins in all = Number of penguins inside the cave + Number of penguins outside the cave
= 4 + 3
= 7 or Seven.

Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.3 Both Addends Unknown-Guided Practice-

Case:2:
Number of penguins outside the cave = 4 or Four.
Number of penguins inside the cave = 3 or Three.
Total number of penguins in all = Number of penguins inside the cave + Number of penguins outside the cave
= 3 + 4
= 7 or Seven.
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.3 Both Addends Unknown-Guided Practice-1

 

 

Question 1.
5 penguins in all
Envision Math Common Core 1st Grade Answers Topic 1 Understand Addition and Subtraction 40.4
Answer:
Total number of penguins in all = Number of penguins inside the cave + Number of penguins outside the cave
= 3 + 2
= 5 or Five.

Explanation:
Number of penguins inside the cave = 3 or Three.
Number of penguins outside the cave = 2 or Two.
Total number of penguins in all = Number of penguins inside the cave + Number of penguins outside the cave
= 3 + 2
= 5 or Five.
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.3 Both Addends Unknown-Guided Practice-1..

 

 

Question 2.
8 penguins in all
Envision Math Common Core 1st Grade Answers Topic 1 Understand Addition and Subtraction 40.5
Answer:
Total number of penguins in all = Number of penguins inside the cave + Number of penguins outside the cave
= 4 + 4
= 8 or Eight.

Explanation:
Number of penguins inside the cave = 4 or Four.
Number of penguins outside the cave = 4 or Four.
Total number of penguins in all = Number of penguins inside the cave + Number of penguins outside the cave
= 4 + 4
= 8 or Eight.
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.3 Both Addends Unknown-Guided Practice-2

 

 

 

Independent Practice
How many bats are inside and outside? Use cubes or draw a picture. Write an equation.

Question 3.
9 bats in all
Envision Math Common Core 1st Grade Answers Topic 1 Understand Addition and Subtraction 40.6
Answer:
Total number of bats in all = Number of bats inside the cave + Number of bats outside the cave
= 5 + 4
= 9 or Nine.

Explanation:
Number of bats inside the cave = 5 or Five.
Number of bats outside the cave = 4 or Four.
Total number of bats in all = Number of bats inside the cave + Number of bats outside the cave
= 5 + 4
= 9 or Nine.
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.3 Both Addends Unknown-Independent Practice-3

Question 4.
8 bats in all
Envision Math Common Core 1st Grade Answers Topic 1 Understand Addition and Subtraction 40.7
Answer:
Total number of bats in all = Number of bats inside the cave + Number of bats outside the cave
= 4 + 4
= 8 or Eight.

Explanation:
Number of bats inside the cave = 4 or Four.
Number of bats outside the cave = 4 or Four.
Total number of bats in all = Number of bats inside the cave + Number of bats outside the cave
= 4 + 4
= 8 or Eight.

Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.3 Both Addends Unknown-Independent Practice-4

 

 

Question 5.
5 bats in all
Envision Math Common Core 1st Grade Answers Topic 1 Understand Addition and Subtraction 40.8
Answer:
Total number of bats in all = Number of bats inside the cave + Number of bats outside the cave
= 3 + 2
= 5 or Five.

Explanation:
Number of bats inside the cave = 3 or Three.
Number of bats outside the cave = 2 or Two.
Total number of bats in all = Number of bats inside the cave + Number of bats outside the cave
= 3 + 2
= 5 or Five.
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.3 Both Addends Unknown-Independent Practice-5

 

 

Question 6.
4 bats in all
Envision Math Common Core 1st Grade Answers Topic 1 Understand Addition and Subtraction 40.9
Answer:
Total number of bats in all = Number of bats inside the cave + Number of bats outside the cave
= 2 + 2
= 4  or Four.

Explanation:
Number of bats inside the cave = 2 or Two.
Number of bats outside the cave = 2 or Two.
Total number of bats in all = Number of bats inside the cave + Number of bats outside the cave
= 2 + 2
= 4  or Four.
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.3 Both Addends Unknown-Independent Practice-6

 

Problem Solving
Solve each problem.

Question 7.
envision® STEM
8 monkeys in all. Some live in trees. Some live on the ground. Show one way.
Envision Math Common Core 1st Grade Answers Topic 1 Understand Addition and Subtraction 40.10
Envision Math Common Core 1st Grade Answers Topic 1 Understand Addition and Subtraction 40.11
Answer:
Total number of monkeys in all = Number of monkeys live in trees + Number of monkeys live on the ground
= 4 + 4
= 8 or Eight.

Explanation:
Number of monkeys live in trees = 4 or Four.
Number of monkeys live on the ground =4 or Four.
Total number of monkeys in all = Number of monkeys live in trees + Number of monkeys live on the ground
= 4 + 4
= 8 or Eight.

Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.3 Both Addends Unknown-Problem Solving-7

 

 

Question 8.
Reasoning
Anna draws 2 cats. She draws 5 more cats. How many cats in all? Write an equation.
Envision Math Common Core 1st Grade Answers Topic 1 Understand Addition and Subtraction 40.12
Envision Math Common Core 1st Grade Answers Topic 1 Understand Addition and Subtraction 40.13
Answer:
Total number of cats Anna draws in all = 7 or Seven.

Explanation:
Number of cats Anna draws = 2 or Two.
Number of cats Anna draws more = 5 or Five.
Total number of cats Anna draws in all = Number of cats Anna draws + Number of cats Anna draws more
= 2 + 5
= 7 or Seven.
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.3 Both Addends Unknown-Reasoning-8

 

 

Question 9.
Higher Order Thinking
Andy has 10 balls. 1 or 2 balls are inside the toy box. How many balls are outside the toy box? Tell how you know.
Envision Math Common Core 1st Grade Answers Topic 1 Understand Addition and Subtraction 40.14
Answer:
Total number of outside the toy box = 8 or Eight.

Explanation:
Number of balls Andy has = 10 or Ten.
Number of balls inside the toy box = 2 or Two.
Total number of outside the toy box = Number of balls Andy has + Number of balls inside the toy box
= 10 – 2
= 8 or Eight.
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.3 Both Addends Unknown-Higher Order Thinking-9

 

 

Question 10.
Assessment Practice
9 birds in all. Some birds are flying. Some birds are in a tree.
Envision Math Common Core 1st Grade Answers Topic 1 Understand Addition and Subtraction 40.15
Which shows one way?
A. 4 flying, 3 in a tree
B. 5 flying, 4 in a tree
C. 1 flying, 7 in a tree
D. 8 flying, 2 in a tree
Answer:
Total number of birds in all = Number of birds flying + Number of birds in a tree
= 5 + 4
= 9 or Nine.
B. 5 flying, 4 in a tree shows one way.

Explanation:
Number of birds flying = 5 or Five.
Number of birds in a tree = 4 or Four.
Total number of birds in all = Number of birds flying + Number of birds in a tree
= 5 + 4
= 9 or Nine.

Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.3 Both Addends Unknown-Assessment Practice-10

 

 

Lesson 1.4 Take from

Solve and Share

There are 6 ducks. Some fly away. How many ducks are left?
Envision Math Common Core 1st Grade Answers Topic 1 Understand Addition and Subtraction 41.1
Answer:
Number of ducks left = 4 or Four.

Explanation:
Total number of ducks = 6 or Six.
Number of ducks flying away = 2 or Two.
Number of ducks left = Total number of ducks – Number of ducks flying away
= 6 – 2
= 4 or Four.

Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.4 Take from-Solve and Share

 

 

Visual Learning Bridge

Envision Math Common Core 1st Grade Answers Topic 1 Understand Addition and Subtraction 41.2

Convince Me!
How do cubes help you solve the problem?
Answer:
The cubes strategy is a simple tool that helps in step-by-step calculation of addition or subtraction and to solve the problem asked.

Explanation:
The 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  and to understand the problem and solve it.

 

 

Guided Practice
Solve. Use cubes to help. Write a subtraction equation.

Question 1.
There are 6 frogs. 2 frogs jump off.
Envision Math Common Core 1st Grade Answers Topic 1 Understand Addition and Subtraction 41.3
How many frogs are left?
Envision Math Common Core 1st Grade Answers Topic 1 Understand Addition and Subtraction 41.4
Answer:
Number of frogs are left = 4 or Four.

Explanation:
Total number of frogs in all = 6 or Six.
Number of frogs jump off = 2 Or Two.
Number of frogs are left = Total number of frogs in all  – Number of frogs jump off
= 6 – 2
= 4 or Four.

Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.4 Take from-Guided Practice

 

 

Question 2.
There are 7 bunnies. 1 bunny hops away.
Envision Math Common Core 1st Grade Answers Topic 1 Understand Addition and Subtraction 41.5
How many bunnies are left?
Envision Math Common Core 1st Grade Answers Topic 1 Understand Addition and Subtraction 41.6
Answer:
Number of bunnies are left = 6 or Six.

Explanation:
Total number of bunnies in all = 7 or Seven.
Number of bunnies hops away = 1 or One.
Number of bunnies are left = Total number of bunnies in all – Number of bunnies hops away
= 7 – 1
= 6 or Six.
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.4 Take from-Guided Practice-2

 

 

Independent Practice
Solve. Use cubes or draw a picture. Write a subtraction equation.

Question 3.
There are 8 bugs. 4 bugs fly away.
Envision Math Common Core 1st Grade Answers Topic 1 Understand Addition and Subtraction 41.7
How many bugs are left?
Envision Math Common Core 1st Grade Answers Topic 1 Understand Addition and Subtraction 41.8
Answer:
Number of bugs are left = 4 or Four.

Explanation:
Total number of bugs in all = 8 or Eight.
Number of bugs fly away = 4 or Four.
Number of bugs are left = Total number of bugs in all – Number of bugs fly away
= 8 – 4
= 4 or Four.
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.4 Take from-Independent Practice-3

 

 

Question 4.
There are 9 cats. 6 cats run away.
Envision Math Common Core 1st Grade Answers Topic 1 Understand Addition and Subtraction 41.9
How many cats are left?
Envision Math Common Core 1st Grade Answers Topic 1 Understand Addition and Subtraction 41.10
Answer:
Number of cats are left = 3 or Three.

Explanation:
Total number of cats in all = 9 or Nine.
Number of cats run away = 6 or Six.
Number of cats are left = Total number of cats in all – Number of cats run away
= 9 – 6
= 3 or Three.
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.4 Take from-Independent Practice-4

Question 5.
Higher Order thinking
There are 7 dogs. Some run away. 3 dogs are left. How many dogs ran away.
Envision Math Common Core 1st Grade Answers Topic 1 Understand Addition and Subtraction 41.11
____ dogs
Answer:
Number of dogs run away = 4 or Four.

Explanation:
Total number of dogs in all = 7 or Seven.
Number of dogs left = 3 or Three.
Number of dogs run away = Total number of dogs in all – Number of dogs left
= 7 – 3
= 4 or Four.
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.4 Take from-Higher Order thinking-5

 

Problem Solving
Solve each problem.

Question 6.
Reasoning
Lin has 9 stamps. She gives away 4 stamps. How many stamps are left?
Envision Math Common Core 1st Grade Answers Topic 1 Understand Addition and Subtraction 41.12
Answer:
Number of stamps left with Lin = 5 or Five.

Explanation:
Total number of stamps Lin has in all = 9 or Nine.
Number of stamps Lin gives away = 4 or Four.
Number of stamps left with Lin = Total number of stamps Lin has in all – Number of stamps Lin gives away
= 9 – 4
= 5 or Five.
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.4 Take from-Reasoning-6

 

Question 7.
Reasoning
Gloria has 8 flowers. She gives away 5 flowers. How many flowers are left?
Envision Math Common Core 1st Grade Answers Topic 1 Understand Addition and Subtraction 41.13
Answer:
Number of flowers left with Gloria = 3 or Three.

Explanation:
Total number of flowers Gloria has in all = 8 or Eight.
Number of flowers Gloria gives away = 5 or Five.
Number of flowers left with Gloria = Total number of flowers Gloria has in all – Number of flowers Gloria gives away
= 8 – 5
= 3 or Three.
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.4 Take from-Reasoning- 7

 

Question 8.
Higher Order Thinking
Find the missing number. Write a subtraction story for the equation.
Envision Math Common Core 1st Grade Answers Topic 1 Understand Addition and Subtraction 41.14
Answer:
Mrs. Shas has 7 balloons. She gives away 2 balloons. How many balloons are left?
Number of balloons left with Mrs. Shas = 5 or Five.

Explanation:
Mrs. Shas has 7 balloons. She gives away 2 balloons. How many balloons are left?
Total number of balloons Mrs. Shas has in all = 7 or Seven.
Number of balloons Mrs. Shas gives away = 2 or Two.
Number of balloons left with Mrs. Shas = Total number of balloons Mrs. Shas has in all – Number of balloons Mrs. Shas gives away
= 7 – 2
= 5 or Five.
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.4 Take from-Higher Order Thinking-8

Question 9.
Assessment Practice
There are 8 bees. 6 bees fly away. How many bees are left?
Envision Math Common Core 1st Grade Answers Topic 1 Understand Addition and Subtraction 41.15
A. 8 – 2 = 6 bees
B. 8 – 7 = 1 bees
C. 7 – 2 = 5 bees
D. 8 – 6 = 2 bees
Answer:
Number of bees are left = 2 or Two.
D. 8 – 6 = 2 bees

Explanation:
Total number of bees in all = 8 or Eight.
Number of bees fly away = 6 or Six.
Number of bees are left = Total number of bees in all – Number of bees fly away
= 8 – 6
= 2 or Two.
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.4 Take from-Assessment Practice-9

Lesson 1.5 Compare Situations

There are 5 red cars and 3 blue cars. Are there more red cars or blue cars? How many more? Show how you know.
Envision Math Common Core Grade 1 Answers Topic 1 Understand Addition and Subtraction 50.1
Answer:
There are 2 red cars more than the blue cars.
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.5 Compare Situations

Explanation:
Number of red cars = 5 or Five.
Number of blue cars = 3 or Three.
Difference = Number of red cars – Number of blue cars
= 5 – 3
= 2 or Two.

 

 

Envision Math Common Core Grade 1 Answers Topic 1 Understand Addition and Subtraction 50.2

Convince Mel
Can you also add to solve the problem above? Explain.
Answer:
No, 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.

Explanation:
You need to find the difference between the blue hats and orange hats to know how many more.

Guided Practice
Use cubes to help. Write an equation. Then solve.

Question 1.
6 yellow frogs 3 green frogs
Envision Math Common Core Grade 1 Answers Topic 1 Understand Addition and Subtraction 50.3
How many more yellow frogs than green frogs are there? more yellow frogs
Envision Math Common Core Grade 1 Answers Topic 1 Understand Addition and Subtraction 50.4
Answer:
There are 3 yellow frogs more than the green frogs.

Explanation:
Number of yellow frogs = 6 or Six.
Number of green frogs = 3 or Three.
Difference = Number of yellow frogs – Number of green frogs
= 6 – 3
= 3 or Three.
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.5 Compare Situations-Guided Practice-1

 

Independent Practice
Use cubes or draw a picture. Write an equation. Then solve.

Question 2.
3 brown dogs I black dog
Envision Math Common Core Grade 1 Answers Topic 1 Understand Addition and Subtraction 50.5
How many more brown dogs than black dogs are there?
Envision Math Common Core Grade 1 Answers Topic 1 Understand Addition and Subtraction 50.6
____ more brown dogs
Answer:
There are 2 brown dogs more than the black dogs.
_2__ more brown dogs.

Explanation:
Number of brown dogs = 3 or Three.
Number of black dogs = 1 or One.
Difference = Number of brown dogs – Number of black dogs
= 3 – 1
= 2 or Two.
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.5 Compare Situations-Independent Practice-2

Question 3.
7 red beads 4 green beads
Envision Math Common Core Grade 1 Answers Topic 1 Understand Addition and Subtraction 50.7
How many more red beads than green beads are there?
Envision Math Common Core Grade 1 Answers Topic 1 Understand Addition and Subtraction 50.8
___ more red beads
Answer:
There are 3 red beads more than the green beads.

Explanation:
Number of red beads= 7 or Seven.
Number of green beads = 4 or Four.
Difference = Number of red beads – Number of green beads
= 7 – 4
= 3 or Three.
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.5 Compare Situations-Independent Practice-3

 

Higher Order Thinking

There are more blue birds than yellow birds. Write 2 equations to show. Then solve.

Envision Math Common Core Grade 1 Answers Topic 1 Understand Addition and Subtraction 50.10

Question 4.
Envision Math Common Core Grade 1 Answers Topic 1 Understand Addition and Subtraction 50.9
Answer:
Equation:1:
Difference = Number of blue birds – Number of yellow birds
= 5 – 3
= 2 or Two.

Equation:2:
Number of blue birds  = Number of birds flu away + Number of yellow birds
= 2 + 3
= 5 or Five.

Explanation:
Equation:1:
Number of blue birds = 5 or Five.
Number of yellow birds = 3 or Three.
Difference = Number of blue birds – Number of yellow birds
= 5 – 3
= 2 or Two.

Equation:2:
Number of birds flu away = 2 or Two.
Number of yellow birds = 3 or Three.
Number of blue birds  = Number of birds flu away + Number of yellow birds
= 2 + 3
= 5 or Five.

Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.5 Compare Situations-Higher Order Thinking-4

 

Problem Solving
Solve each problem. Use cubes or draw a picture.

Question 5.
Number Sense 4 fish are in a tank. 2 fish are sold. How many fish are left?
Envision Math Common Core Grade 1 Answers Topic 1 Understand Addition and Subtraction 50.11
Answer:
Number of fishes left in the tank = 2 or Two.

Explanation:
Number of fishes in a tank = 4 or Four.
Number of fishes sold = 2 or Two.
Number of fishes left in the tank = Number of fishes in a tank – Number of fishes sold
= 4 – 2
= 2 or Two.
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.5 Compare Situations-Problem Solving-5

 

Question 6.
Model
Luis sees 5 green frogs. He sees I blue frog. How many more green frogs than blue frogs does Luis see?
Envision Math Common Core Grade 1 Answers Topic 1 Understand Addition and Subtraction 50.12
___ more green frogs
Answer:
There are 4 green frogs seen by Luis more than the blue frogs seen by her.
_4__ more green frogs.

Explanation:
Number of green frogs Luis sees = 5 or Five.
Number of blue frogs Luis sees = 1 or One.
Difference = Number of green frogs Luis sees – Number of blue frogs Luis sees
= 5 – 1
= 4 or Four.

 

Question 7.
Higher Order Thinking
Draw some yellow flowers. Draw more red flowers than yellow flowers. How many more red flowers than yellow flowers are there?
Envision Math Common Core Grade 1 Answers Topic 1 Understand Addition and Subtraction 50.13
Answer:
There are 2 red flowers more than the yellow flowers.

Explanation:
Number of red flowers = 6 or Six.
Number of yellow flowers = 4 or Four.
Difference = Number of red flowers – Number of yellow flowers
= 6 – 4
= 2 or Two.
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.5 Compare Situations-Higher Order Thinking-7

 

Question 8.
Assessment Practice
6 gray cats
4 white cats
How many more gray cats than white cats are there?
A. 2 more gray cats
B. 4 more gray cats
C. 6 more gray cats
D. 10 more gray cats
Envision Math Common Core Grade 1 Answers Topic 1 Understand Addition and Subtraction 50.14
Answer:
There are 2 gray cats more than the white cats.
A. 2 more gray cats

Explanation:
Number of gray cats = 6 or Six.
Number of white cats = 4 or Four.
Difference = Number of gray cats – Number of white cats
= 6 – 4
= 2 or Two.
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.5 Compare Situations-Assessment Practice-8

 

 

 

Lesson 1.6 More Compare Situations

Envision Math Common Core Grade 1 Answers Topic 1 Understand Addition and Subtraction 50.15
Amy has 7 stickers. Tim has 5 stickers. Who has fewer stickers? How many fewer? Show how you know.
Answer:
Tim has 2 stickers fewer than Amy.

Explanation:
Number of  stickers Amy has = 7 or Seven.
Number of  stickers Tim has = 5 or Five.
Difference = Number of  stickers Amy has – Number of  stickers Tim has
= 7 – 5
= 2 or Two.
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.6 More Compare Situations

 

 

 

Visual Learning Bridge
Envision Math Common Core Grade 1 Answers Topic 1 Understand Addition and Subtraction 50.16

Convince Me!

How is finding how many fewer like finding how many more?
Answer:
Finding how many fewer is same like finding how many more because the process is to find how much and how many.

Explanation:
Finding 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.

 

Guided Practice
Use cubes to help. Write an equation. Then solve.

Question 1.
Juan has 8 red crayons. Sue has 2 blue crayons.
Envision Math Common Core Grade 1 Answers Topic 1 Understand Addition and Subtraction 50.17
How many fewer crayons does Sue have than Juan?
Envision Math Common Core Grade 1 Answers Topic 1 Understand Addition and Subtraction 50.18
Answer:
6 fewer crayons Sue has than Juan has.

Explanation:
Number of  red crayons Juan has = 8 or Eight.
Number of  blue crayons Sue has = 2 or Two,.
Difference = Number of red crayons Juan has – Number of blue crayons Sue has
= 8 – 2
= 6 or Six.
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.6 More Compare Situations-Guided Practice-1

 

Question 2.
Ann has 4 purple grapes. Sam has 7 green grapes.
Envision Math Common Core Grade 1 Answers Topic 1 Understand Addition and Subtraction 50.19
How many fewer grapes does Ann have than Sam?
Envision Math Common Core Grade 1 Answers Topic 1 Understand Addition and Subtraction 50.20
Answer:
3 fewer grapes Ann have than Sam.

Explanation:
Number of purple grapes Ann has = 4 or Four.
Number of green grapes Sam has = 7 or Seven,.
Difference = Number of green grapes Sam has – Number of purple grapes Ann has
= 7 – 4
= 3 or Three.
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.6 More Compare Situations-Guided Practice-2

 

Independent Practice
Use cubes or draw a picture. Write an equation. Then solve.

Question 3.
Emma buys 10 red apples. She buys 5 green apples.
Envision Math Common Core Grade 1 Answers Topic 1 Understand Addition and Subtraction 50.21
How many fewer green apples than red apples does Emma buy?
Envision Math Common Core Grade 1 Answers Topic 1 Understand Addition and Subtraction 50.22
Answer:
5 fewer green apples than red apples Emma buys.

Explanation:
Number of red apples Emma buys = 10 or Ten.
Number of green apples Emma buys = 5 or Five.
Difference = Number of red apples Emma buys – Number of green apples Emma buys
= 10 – 5
= 5 or Five.
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.6 More Compare Situations-Independent Practice-3

 

Question 4.
Beth writes on 3 cards. Joe writes on 9 cards.
Envision Math Common Core Grade 1 Answers Topic 1 Understand Addition and Subtraction 50.23
How many fewer cards does Beth write on than Joe?
Envision Math Common Core Grade 1 Answers Topic 1 Understand Addition and Subtraction 50.24
Answer:
6 fewer cards Beth writes on than Joe.

Explanation:
Number of cards Beth writes = 3 or Three.
Number of cards Joe writes = 9 or Nine.
Difference = Number of cards Joe writes – Number of cards Beth writes
= 9 – 3
= 6 or Six.
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.6 More Compare Situations-Independent Practice-4

 

 

Question 5.
Higher Order Thinking
There are fewer white kites than blue kites. Write 2 equations to show. Then solve.
Envision Math Common Core Grade 1 Answers Topic 1 Understand Addition and Subtraction 50.25
Answer:
Equation:1:
Difference = Number of blue kites – Number of white kites
= 13 – 8
= 5 or Five.

Equation:2:
Number of white kites = Number of blue kites + Difference between the white and blue kites
= 8 + 5
= 13 or Thirteen.

Explanation:
Equation:1:
Number of white kites = 8 or Eight.
Number of blue kites = 13 or Thirteen.
Difference = Number of blue kites – Number of white kites
= 13 – 8
= 5 or Five.

Equation:2:
Number of white kites = ??
Number of blue kites = 13 or Thirteen.
Difference between the white and blue kites = 5 or Five.
Number of white kites = Number of blue kites + Difference between the white and blue kites
= 8 + 5
= 13 or Thirteen.
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.6 More Compare Situations-Higher Order Thinking-5

Problem Solving
Question 6.
Reasoning
Leah has 3 pens. Scott has 6 pens. How many pens do they have in all?
Envision Math Common Core Grade 1 Answers Topic 1 Understand Addition and Subtraction 50.26
Answer:
Total number of pens they have in all = 9 or Nine.

Explanation:
Number of pens Leah has = 3 or Three.
Number of pens Scott has = 6 or Six.
Total number of pens they have in all = Number of pens Leah has + Number of pens Scott has
= 3 + 6
= 9 or Nine.
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.6 More Compare Situations-Problem Solving-Reasoning-6

 

 

Question 7.
Reasoning
There are 7 oranges on a branch. 3 oranges fall off.
Envision Math Common Core Grade 1 Answers Topic 1 Understand Addition and Subtraction 50.27
How many oranges are left?
Envision Math Common Core Grade 1 Answers Topic 1 Understand Addition and Subtraction 50.28
Answer:
Number of oranges left = 4 or Four.

Explanation:
Number of oranges on a branch = 7 or Seven
Number of oranges fell off = 3 or Three.
Number of oranges left = Number of oranges on a branch – Number of oranges fell off
= 7 – 3
= 4 or Four.
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.6 More Compare Situations-Reasoning-7

 

 

Question 8.
Higher Order Thinking
Draw some blue balloons. Draw fewer yellow balloons. How many fewer yellow balloons than blue balloons are there?
Envision Math Common Core Grade 1 Answers Topic 1 Understand Addition and Subtraction 50.29
Answer:
There are 2 fewer yellow balloons than blue balloons.

Explanation:
Number of blue balloons = 5 or Five.
Number of yellow balloons = 3 or Three.
Difference =  Number of blue balloons – Number of yellow balloons
= 5 – 3
= 2 or Two.
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.6 More Compare Situations-Higher Order Thinking-8

 

 

Question 9.
Assessment Practice
8 apple trees
6 pear trees
How many fewer pear trees than apple trees are there?
A. 2 fewer pear trees
B. 3 fewer pear trees
C. 6 fewer pear trees
D. 8 fewer pear trees
Answer:
There are 2 fewer pear trees than apple trees.
A. 2 fewer pear trees

Explanation:
Number of apple trees = 8 or eight.
Number of  pear trees = 6 or Six.
Difference =  Number of apple trees – Number of  pear trees
= 8 – 6
= 2 or Two.
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.6 More Compare Situations-Assessment Practice-9

 

Lesson 1.7 Change Unknown

Solve and Share

There are 5 train cars. More train cars join. Now there are 9 train cars. How many train cars joined?
Envision Math Common Core Grade 1 Answers Topic 1 Understand Addition and Subtraction 51.1
__ trains cars joined.
Answer:
Number of trains cars joined = 4 or Four.
__4__ trains cars joined.

Explanation:
Number of train cars = 5 or Five.
Number of train cars now = 9 or nine.
Number of trains cars joined = Number of train cars now – Number of train cars
= 9 – 5
= 4 or Four.
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.7 Change Unknown

 

Visual Learning Bridge
Envision Math Common Core Grade 1 Answers Topic 1 Understand Addition and Subtraction 51.2

Convince Me!

Can you also subtract to solve the problem above? Explain.
Answer:
Yes, you can subtract to solve the problem above.
Number of cars = 5 or Five
Number of cars now = 9 or Nine.
Number of cars came more = Number of cars now – Number of cars
= 9 – 5
= 4 or Four.

Explanation:
Number of cars = 5 or Five
Number of cars now = 9 or Nine.
Difference:
Number of cars came more = Number of cars now – Number of cars
= 9 – 5
= 4 or Four.
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.7 Change Unknown-Convince Me!

 

Guided Practice
Use cubes to help. Write an equation. Then solve.

Question 1.
Bobby has 4 fish.
Envision Math Common Core Grade 1 Answers Topic 1 Understand Addition and Subtraction 51.3
He buys more fish. Now he has 7 fish. How many fish did Bobby buy?
Envision Math Common Core Grade 1 Answers Topic 1 Understand Addition and Subtraction 51.4
Answer:
Number of fishes Bobby buys = 3 or Three.

Explanation:
Number of fishes Bobby has = 4 or Four.
Number of fishes Bobby has now = 7 or seven.
Number of fishes Bobby buys = Number of fishes Bobby has now – Number of fishes Bobby has
= 7 – 4
= 3 or Three.
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.7 Change Unknown-Guided Practice-1

 

Independent Practice

Use cubes or draw a picture. Write an equation. Then solve.

Question 2.
Mary has 4 stickers.
Envision Math Common Core Grade 1 Answers Topic 1 Understand Addition and Subtraction 51.5
Pat gives her more stickers. Now Mary has 8 stickers. How many stickers did Pat give Mary?
Envision Math Common Core Grade 1 Answers Topic 1 Understand Addition and Subtraction 51.6
Answer:
Number of stickers Pat gives her more = 4 or Four.

Explanation:
Number of stickers Mary has = 4 or Four.
Number of stickers Mary has now = 8 or Eight.
Number of stickers Pat gives her more = Number of stickers Mary has now – Number of stickers Mary has
= 8 – 4
= 4 or Four.
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.7 Change Unknown-Independent Practice-2

 

 

Question 3.
Billy draws 4 red cars.
Envision Math Common Core Grade 1 Answers Topic 1 Understand Addition and Subtraction 51.7
Then he draws some blue cars. Now there are 10 cars. How many blue cars did Billy draw?
Envision Math Common Core Grade 1 Answers Topic 1 Understand Addition and Subtraction 51.8
Answer:
Number of blue cars Billy draws = 6 or Six.

Explanation:
Number of red cars Billy draws = 4 or Four.
Number of cars Billy has now = 10 or Ten.
Number of blue cars Billy draws = Number of cars Billy has now – Number of red cars Billy draws
= 10 – 4
= 6 or Six.
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.7 Change Unknown-Independent Practice-3

 

Question 4.
Higher Order Thinking
Some 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.
Envision Math Common Core Grade 1 Answers Topic 1 Understand Addition and Subtraction 51.9
Answer:
Equation:1:
Number of girls are on the bus = Number of children on the bus now – Number of boys get on the bus
= 7 – 2
= 5 or Five.

Equation:2:
Number of children on the bus now = Number of boys get on the bus + Number of girls are on the bus
=> 7 = 2 + Number of girls are on the bus
=> 7 – 2 = Number of girls are on the bus
=> 5 or Five = Number of girls are on the bus.

Explanation:
Equation:1:
Number of boys get on the bus = 2 or Two.
Number of children on the bus now =7 or Seven.
Number of girls are on the bus = Number of children on the bus now – Number of boys get on the bus
= 7 – 2
= 5 or Five.

Equation:2:
Number of children on the bus now =7 or Seven.
Number of boys get on the bus = 2 or Two.
Number of girls are on the bus = ??
Number of children on the bus now = Number of boys get on the bus + Number of girls are on the bus
=> 7 = 2 + Number of girls are on the bus
=> 7 – 2 = Number of girls are on the bus
=> 5 = Number of girls are on the bus.
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.7 Change Unknown-Higher Order Thinking-4

 

Problem Solving
Solve each problem.

Question 5.
6 pencils are on the desk.
Envision Math Common Core Grade 1 Answers Topic 1 Understand Addition and Subtraction 51.10
Bob adds more pencils. Now there are 9 pencils. How many pencils did Bob add?
Answer:
Number of pencils Bob added more = 3 or Three.

Explanation:
Number of pencils are on the desk = 6 or Six.
Number of pencils now = 9 or Nine.
Number of pencils Bob added more = Number of pencils now – Number of pencils are on the desk
= 9 – 6
= 3 or Three.
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.7 Change Unknown-Problem Solving-5

 

Question 6.
Use Tools
Nora has 3 pretzels and 7 crackers. How many snacks does she have in all?
Envision Math Common Core Grade 1 Answers Topic 1 Understand Addition and Subtraction 51.11
Answer:
Number of snacks Nora has in all = 10 or Ten.

Explanation:
Number of pretzels Nora has = 3 or Three.
Number of crackers Nora has = 7 or Seven.
Number of snacks Nora has in all = Number of pretzels Nora has + Number of crackers Nora has
= 3 + 7
= 10 or Ten.
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.7 Change Unknown-Use Tools-6

Question 7.
Higher Order Thinking
Some 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?
Envision Math Common Core Grade 1 Answers Topic 1 Understand Addition and Subtraction 51.12
___ yellow birds and _____ blue birds
Answer:
Case:1: _2__ yellow birds and _3____ blue birds
Total number of birds in a tree = Number of yellow birds in a tree + Number of blue birds joined them
= 2 + 3
= 5 or Five.

Case:2: __3__ yellow birds and __2___ blue birds
Total number of birds in a tree = Number of yellow birds in a tree + Number of blue birds joined them
= 3 + 2
= 5 or Five.

Explanation:
Case:1:
Number of yellow birds in a tree = 2 or Two.
Number of blue birds joined them = 3 or Three.
Total number of birds in a tree = Number of yellow birds in a tree + Number of blue birds joined them
= 2 + 3
= 5 or Five.

Case:2:
Number of yellow birds in a tree= 3 or Three.
Number of blue birds joined them  = 2 or Two.
Total number of birds in a tree = Number of yellow birds in a tree + Number of blue birds joined them
= 3 + 2
= 5 or Five.
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.7 Change Unknown-Higher Order Thinking-7

 

Question 8.
Assessment Practice
4 puppies play. More puppies join them. Now there are 7 puppies. How many puppies joined?
A. 5 puppies
B. 4 puppies
C. 3 puppies
D. 2 puppies
Answer:
Total number of puppies joined = 3 or Three.
C. 3 puppies

Explanation:
Number of puppies play = 4 or Four.
Number of puppies now  = 7 or Seven.
Total number of puppies joined = Number of puppies now + Number of puppies play
= 7 – 4
= 3 or Three.
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.7 Change Unknown-Assessment Practice-8

 

 

Lesson 1.8 Practice Adding and Subtracting

Solve & Share

5 pebbles are brown. The other pebbles are black. There are 7 pebbles in all. How many black pebbles are there?
Envision Math Common Core Grade 1 Answers Topic 1 Understand Addition and Subtraction 60.1

Answer:
Number of black pebbles = 2 or Two.

Explanation:
Number of brown pebbles = 5 or Five.
Number of pebbles in all = 7 or Seven.
Number of black pebbles =  Number of pebbles in all – Number of brown pebbles
= 7 – 5
= 2 or Two.
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.8 Practice Adding and Subtracting

 

Visual Learning Bridge
Envision Math Common Core Grade 1 Answers Topic 1 Understand Addition and Subtraction 60.2

Convince Me!
Compare the addition and subtraction equations. What do you notice about the numbers?

Answer:
Its noticed that both the addition equation and subtraction equation results of finding the girls strength are same.

Explanation:
Addition equation:
Number of boys in the class = 5 or Five.
Total number of students in the class = 8 or Eight.
Number of girls in the class + Number of boys in the class = Total number of students in the class
=> ?? + 5 = 8.
=> 3 + 5 = 8

Subtraction equation:
Number of boys in the class = 5 or Five.
Total number of students in the class = 8 or Eight.
Number of girls in the class = Total number of students in the class – Number of boys in the class
= 8 – 5
= 3 or Three.

 

Guided Practice
Use cubes to help.
Write an equation. Then solve.

Question 1.
Nick has 9 robots. 3 of the robots can talk.
Envision Math Common Core Grade 1 Answers Topic 1 Understand Addition and Subtraction 60.3
How many robots cannot talk?
Envision Math Common Core Grade 1 Answers Topic 1 Understand Addition and Subtraction 60.4
Answer:
Number of robots cannot walk = 6 or Six.

Explanation:
Number of robots Nick has = 9 or Nine.
Number of robots can walk = 3 or Three.
Number of robots Nick has = Number of robots can walk + Number of robots cannot walk
=> 9 = 3 + ??
=> 9 = 3 + 6
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.8 Practice Adding and Subtracting-Guided Practice-1

Question 2.
6 children play at the beach. 2 children are girls.
Envision Math Common Core Grade 1 Answers Topic 1 Understand Addition and Subtraction 60.5
How many are boys?
Envision Math Common Core Grade 1 Answers Topic 1 Understand Addition and Subtraction 60.6
Answer:
Number of boys playing at the beach = 4 or Four.

Explanation:
Number of girls playing at the beach = 2 or Two.
Total number of children playing at the beach = 6 or Six.
Number of boys playing at the beach = Total number of children playing at the beach – Number of girls playing at the beach
= 6 – 2
= 4 or Four.
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.8 Practice Adding and Subtracting-Guided Practice-2

 

 

Independent Practice
Use cubes or draw a picture. Write an equation. Then solve.

Question 3.
Jill has 9 cards. 5 cards are soccer cards.
Envision Math Common Core Grade 1 Answers Topic 1 Understand Addition and Subtraction 60.7
The rest are baseball cards. How many baseball cards are there?
Envision Math Common Core Grade 1 Answers Topic 1 Understand Addition and Subtraction 60.8
___ baseball cards
Answer:
Number of baseball cards = 4 or Four.
__4__ baseball cards.

Explanation:
Total number of cards Jill has = 9  or Nine.
Number of soccer cards = 5 or Five.
Number of baseball cards = Total number of cards Jill has – Number of soccer cards
= 9 – 5
= 4 or Four.
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.8 Practice Adding and Subtracting-Independent Practice-3

 

 

Question 4.
Rita has 7 Shells.
Envision Math Common Core Grade 1 Answers Topic 1 Understand Addition and Subtraction 60.9
3 shells are big. The rest are small. How many small shells does Rita have?
Envision Math Common Core Grade 1 Answers Topic 1 Understand Addition and Subtraction 60.10
__ small shells
Answer:
Number of shells are small = 4 or Four.
_4_ small shells.

Explanation:
Number of shells are big = 3 or Three.
Total number of shells Rita has = 7 or Seven.
Number of shells are small = Total number of shells Rita has – Number of shells are big
= 7 – 3
= 4 or Four.
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.8 Practice Adding and Subtracting-Independent Practice-4

 

 

Question 5.
Higher Order Thinking
Henry 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.
Envision Math Common Core Grade 1 Answers Topic 1 Understand Addition and Subtraction 60.11
Answer:
Equation:1:
Number of blue candles = Total number of candles on Henry cake – Number of green candles
= 6 – 1
= 5 or five.

Equation:2:
Number of green candles  + Number of blue candles = Total number of candles on Henry cake
=> 1 + ?? = 6
=> 1 + 5 = 6.

Number of blue candles = 5 or five.

Explanation:
Equation:1:
Number of green candles = 1 or One.
Total number of candles on Henry cake = 6 or Six.
Number of blue candles = Total number of candles on Henry cake – Number of green candles
= 6 – 1
= 5 or five.

Equation:2:
Number of green candles = 1 or One.
Total number of candles on Henry cake = 6 or Six.
Number of green candles  + Number of blue candles = Total number of candles on Henry cake
=> 1 + ?? = 6
=> 1 + 5 = 6.
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.8 Practice Adding and Subtracting-Higher Order Thinking-5

 

 

Problem Solving
Solve each problem.

Question 6.
Make Sense
Joe buys 2 red fish. He buys some blue fish. He buys 9 fish in all. How many blue fish does Joe buy?
Envision Math Common Core Grade 1 Answers Topic 1 Understand Addition and Subtraction 60.12
____ blue fish
Answer:
Number of blue fishes Joe buys = 7 or Seven.
__7__ blue fish.

Explanation:
Number of red fishes Joe buys = 2  or Two.
Total number of fishes Joe buys in all  = 9 or Nine.
Number of blue fishes Joe buys = Total number of fishes Joe buys in all – Number of red fishes Joe buys
= 9 – 2
= 7 or Seven.
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.8 Practice Adding and Subtracting-Problem Solving-6

 

Question 7.
Make Sense
Rachel has 8 nickels. She gives away 4 nickels. How many nickels are left?
Envision Math Common Core Grade 1 Answers Topic 1 Understand Addition and Subtraction 60.13
__ nickels
Answer:
Number of nickels left = 4 or Four.
__4__ nickels.

Explanation:
Number of nickels Rachel gives away = 4 or Four.
Total number of nickels Rachel has in all  = 8 or Eight.
Number of nickels left = Total number of nickels Rachel has in all  – Number of nickels Rachel gives away
= 8 – 4
= 4 or Four.
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.8 Practice Adding and Subtracting-Make Sense-7

Question 8.
Higher Order Thinking
Nina has 8 stuffed animals. Some are bears. Some are tigers. How many of each animal could Nina have?
Envision Math Common Core Grade 1 Answers Topic 1 Understand Addition and Subtraction 60.14
__ bears and __ tigers
Answer:
Nina can have 4 bears and 4 tigers each.
_4_ bears and _4_ tigers.

Explanation:
Total number of stuffed animals Nina has = 8 or Eight.
Number of bears + Number of tigers = Total  number of stuffed animals Nina has
=> ?? + ?? = 8
=> 4 + 4 = 8.
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.8 Practice Adding and Subtracting-Higher Order Thinking-8

Question 9.
Assessment Practice
Liz and Mary have 7 fish in all. Liz has 2 fish. How many fish does Mary have? Which equation matches the story?
A. 9 – 2 = 7 fish
B. 7 – 1 = 6 fish
C. 7 – 2 = 5 fish
D. 8 – 7 = 1 fish
Envision Math Common Core Grade 1 Answers Topic 1 Understand Addition and Subtraction 60.15
Answer:
Number of fishes Mary has = 5 or Five.
C. 7 – 2 = 5 fish

Explanation:
Number of fishes Liz has = 2 or Two.
Number of fishes Liz and Mary have in all = 7 or Seven.
Number of fishes Mary has = Number of fishes Liz and Mary have in all – Number of fishes Liz has
= 7 – 2
= 5 or Five.
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.8 Practice Adding and Subtracting-Assessment Practice-9

 

Lesson 1.9 Construct Arguments

Do you add or subtract to solve the problem? Tell why. Show how to solve. Use pictures, numbers, or words
Envision Math Common Core 1st Grade Answer Key Topic 1 Understand Addition and Subtraction 70.1

Answer:
Number of more rabbits than turtles = 4 or Four.

Explanation:
Number of rabbits = 7 or Seven.
Number of turtles = 3 or Three.
Number of more rabbits than turtles = Number of rabbits – Number of turtles
= 7 – 3
= 4 or Four.
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.9 Construct Arguments

 

 

Thinking Habits
How can I use math to explain my work?
Is my explanation clear?
Envision Math Common Core 1st Grade Answer Key Topic 1 Understand Addition and Subtraction 70.2
Answer:
I 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.
Yes, my is explanation clear.

Explanation:
I 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.
Yes, my is explanation clear because it is simple and easy to understand.

 

Visual Learning Bridge
Envision Math Common Core 1st Grade Answer Key Topic 1 Understand Addition and Subtraction 70.3

Convince Me!

Look at the two ways to find the number of red crayons. How are the ways alike? How are the ways different?

Answer:
The 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.

Explanation:
Way:1:
Number of blue crayons = 6 or Six.
Total number of crayons in all = 9 or Nine.
Number of red crayons = Total number of crayons in all – Number of blue crayons
= 9 – 6
= 3 or Three.

Way:2:
Number of blue crayons = 6 or Six.
Total number of crayons in all = 9 or Nine.
Number of red crayons + Number of blue crayons = Total number of crayons in all
=> ?? + 6 = 9
=> 3 + 6 = 9.
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.9 Construct Arguments-Convince Me!

 

 

Guided Practice
Solve. Use pictures, numbers, or words to explain.

Question 1.
Manny draws 6 tiles. 4 tiles are red. The others are green. How many green tiles does Manny draw?
Envision Math Common Core 1st Grade Answer Key Topic 1 Understand Addition and Subtraction 70.4
Answer:
Number of green tiles Manny draws = 2 or Two.

Explanation:
Number of tiles Manny draws = 6 or Six.
Number of red tiles Manny draws = 4 or Four.
Number of green tiles Manny draws = Number of tiles Manny draws – Number of red tiles
= 6 – 4
= 2 or Two.
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.9 Construct Arguments-Guided Practice-1

 

Independent Practice
Solve. Use pictures, numbers, or words to explain.

Question 2.
Jan has 8 pennies. She spends 5 pennies. How many pennies does Jan have left?
Answer:
Number of pennies left = 3 or Three.

Explanation:
Number of pennies Jan has = 8 or Eight.
Number of pennies Jan spends = 5 or Five.
Number of pennies left = Number of pennies Jan has – Number of pennies Jan spends
= 8 – 5
= 3 or Three.
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.9 Construct Arguments-Independent Practice-2

 

Question 3.
Lidia has 7 pencils. Jon has 2 pencils. Who has fewer pencils? How many fewer?
Answer:
Jon has fewer pencils by 5 or five.

Explanation:
Number of  pencils Lidia has = 7 or Seven
Number of pencils Jon has = 2 or Two.
Difference =Number of  pencils Lidia has – Number of pencils Jon has
= 7 – 2
= 5 or Five.
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.9 Construct Arguments-Independent Practice-3

 

 

Question 4.
Higher Order Thinking
Max has 3 apples. He buys 2 more apples. He gives away 4 apples. How many apples does Max have left? Explain.
Answer:
Number of apples left = 1 or One.

Explanation:
Number of apples Max has = 3 or Three.
Number of more apples Max buys = 2 or Two.
Total number of apples Max has = Number of apples Max has + Number of more apples Max buys
= 3 + 2
= 5 or Five.

Number of apples Max gives away = 4 or Four.
Number of apples left = Total number of apples Max has – Number of apples Max gives away
= 5 – 4
= 1 or One.
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.9 Construct Arguments-Higher Order Thinking-4

 

Problem Solving
Performance Task
Lemonade Stand
Some friends sell lemonade. Solve each problem. Use pictures, numbers, or words to explain.
Envision Math Common Core 1st Grade Answer Key Topic 1 Understand Addition and Subtraction 70.5

Question 5.
Explain
Alex sells 3 cups. Mark sells 5 cups. How many cups do they sell in all? Here is Alex’s work.
Envision Math Common Core 1st Grade Answer Key Topic 1 Understand Addition and Subtraction 70.6
Is his work correct? Tell why.
Answer:
Total number of cups sold in all = 8 or Eight.
His work is correct has the answer is correct.

Explanation:
Number of cups Alex sells = 3 or Three.
Number of cups Mark sells = 5 or Five.
Total number of cups sold in all = Number of cups Alex sells + Number of cups Mark sells
= 3 + 5
= 8 or Eight.
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.9 Construct Arguments-Problem Solving-5

 

 

Question 6.
Be Precise
Mia sells 2 cups.
Gina sells 6 cups.
How many more cups does Gina sell than Mia?
Answer:
4 more cups Gina sells than Mia.

Explanation:
Number of cups Mia sells = 2 or Two.
Number of cups Gina sells = 6 or Six.
Difference = Number of cups Gina sells – Number of cups Mia sells
= 6 – 2
= 4 or Four.
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.9 Construct Arguments-Be Precise-6

 

Fluency Review Activity

Color these sums and differences. Leave the rest white.
Envision Math Common Core 1st Grade Answer Key Topic 1 Understand Addition and Subtraction 86.0
Answer:
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.9 Construct Arguments-Fluency Review Activity

Vocabulary Review
Understand Vocabulary

Question 1.
Write an addition equation
Envision Math Common Core 1st Grade Answer Key Topic 1 Understand Addition and Subtraction 86.1
Answer:
Addition equation:
2  +  2  =  4.
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.9 Construct Arguments-Fluency Review Activity-Vocabulary Review-1

Explanation:
Addition equation:
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.9 Construct Arguments-Fluency Review Activity-Vocabulary Review-1

Question 2.
Write a subtraction equation.
Envision Math Common Core 1st Grade Answer Key Topic 1 Understand Addition and Subtraction 86.1
Answer:
Subtraction equation:
8  –  3  =  5.
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.9 Construct Arguments-Fluency Review Activity-Vocabulary Review-2

Explanation:
Subtraction equation:
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.9 Construct Arguments-Fluency Review Activity-Vocabulary Review-2

 

Question 3.
Circle the difference
8 – 2 = 6
Answer:
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.9 Construct Arguments-Fluency Review Activity-Vocabulary Review-3

Explanation:
Difference:
8 – 2 = 6.

 

 

Question 4.
Circle one part.
5 + 3 = 8
Answer:
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.9 Construct Arguments-Fluency Review Activity-Vocabulary Review-4

Explanation:
Addition Equation:
5 + 3 = 8.

 

 

Question 5.
Circle the plus sign.
3 + 4 = 7
Answer:
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.9 Construct Arguments-Fluency Review Activity-Vocabulary Review-5

Explanation:
Addition Equation:
3 + 4 = 7.

 

Use Vocabulary in Writing

Question 6.
Tell how to find 8-4. Use at least one word from the Word List.
Answer:
Eight – Four = Four.

Explanation:
Eight – Four = Four.
8- 4 = 4 or Four.

 

Set A
You can solve problems about adding to.
3 turtles
1 more joins.
How many turtles now?
Envision Math Common Core 1st Grade Answer Key Topic 1 Understand Addition and Subtraction 86.2
Answer:
Number of turtles now = 4 or Four.

Explanation:
Number of turtles = 3 or Three.
Number of turtles more joined = 1 or One.
Number of turtles now = Number of turtles + Number of turtles more joined
= 3 + 1
= 4 or Four.
Envision Math Common Core 1st Grade Answer Key Topic 1 Understand Addition and Subtraction 86.2

 

Solve. Use cubes or draw a picture.

Question 1.
5 flowers
2 more flowers
How many flowers now?
Envision Math Common Core 1st Grade Answer Key Topic 1 Understand Addition and Subtraction 86.3
Answer:
Number of flowers now = 7 or Seven.

Explanation:
Number of flowers = 5 or Five.
Number of more flowers = 2 or Two.
Number of flowers now = Number of flowers + Number of more flowers
= 5 + 2
= 7 or Seven.
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.9 Construct Arguments-Solve. Use cubes or draw a picture-1

 

 

Set B
You can solve problems about putting together.
3 red markers and 2 blue markers How many markers in all?
Envision Math Common Core 1st Grade Answer Key Topic 1 Understand Addition and Subtraction 86.4
Answer:
Number of markers in all = 5 or Five.

Explanation:
Number of red markers = 3 or Three.
Number of blue markers = 2 or Two.
Number of markers in all = Number of red markers + Number of blue markers
= 3 + 2
= 5 or Five.
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.9 Construct Arguments-Set B

Solve. Use cubes or draw a picture.

Question 2.
4 red cars and 2 blue cars
How many cars in all?
Envision Math Common Core 1st Grade Answer Key Topic 1 Understand Addition and Subtraction 86.5
Answer:
Number of cars in all = 6 or Six.

Explanation:
Number of red cars = 4 or Four.
Number of blue cars = 2 or Two.
Number of cars in all = Number of red cars + Number of blue cars
= 4 + 2
= 6 or Six.
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.9 Construct Arguments-Set B-2

 

 

Set C
You can solve problems with both addends unknown.
7 penguins in all . Some are inside a cave. Some are outside. Here is one way.
Envision Math Common Core 1st Grade Answer Key Topic 1 Understand Addition and Subtraction 86.6

Use cubes or draw a picture. Write an equation to solve.
Answer:
Number of penguins in all = Number of penguins inside the cave + Number of penguins outside the cave
= 5 + 2
= 7 or Seven.

Explanation:
Number of penguins inside the cave = 2 or Two.
Number of penguins outside the cave = 5 or Five.
Number of penguins in all = Number of penguins inside the cave + Number of penguins outside the cave
= 2 + 5
= 7 or Seven.
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.9 Construct Arguments-Set C

Question 3.
6 penguins in all Some are inside. Some are outside. Show one way.
Envision Math Common Core 1st Grade Answer Key Topic 1 Understand Addition and Subtraction 86.7
Answer:
Number of penguins in all = Number of penguins inside the cave + Number of penguins outside the cave
= 2 + 4
= 6 or Six.

Explanation:
Number of penguins inside the cave = 2 or Two.
Number of penguins outside the cave = 4 or Four.
Number of penguins in all = Number of penguins inside the cave + Number of penguins outside the cave
= 2 + 4
= 6 or Six.
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.9 Construct Arguments-Set C-3

 

Question 4.
9 penguins in all Some are inside. Some are outside. Show one way.
Envision Math Common Core 1st Grade Answer Key Topic 1 Understand Addition and Subtraction 86.8
Answer:
Number of penguins in all = Number of penguins inside the cave + Number of penguins outside the cave
=> 9 = 4 + 5
Number of penguins inside the cave = 4 or Four.
Number of penguins outside the cave = 5 or Five.

Explanation:
Number of penguins in all = 9 or Nine.
Number of penguins inside the cave = 4 or Four.
Number of penguins outside the cave = 5 or Five.
Number of penguins in all = Number of penguins inside the cave + Number of penguins outside the cave
=> 9 = 4 + 5

Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.9 Construct Arguments-Set C-4

 

Set D

You can solve problems about taking from.
Envision Math Common Core 1st Grade Answer Key Topic 1 Understand Addition and Subtraction 86.9
There are 6 pears. Mia takes 3 pears away. How many pears are left?
Envision Math Common Core 1st Grade Answer Key Topic 1 Understand Addition and Subtraction 86.10
Answer:
Number of pears are left = 3 or Three.

Explanation:
Number of pears in all = 6 or Six.
Number of pears Mia takes away = 3 or Three.
Number of pears are left = Number of pears in all – Number of pears Mia takes away
= 6 – 3
= 3 or Three.
Envision Math Common Core 1st Grade Answer Key Topic 1 Understand Addition and Subtraction 86.10

 

Use cubes or draw a picture. Write an equation and solve.

Question 5.
There are 7 carrots.
3 carrots are picked.
How many carrots are left?
Envision Math Common Core 1st Grade Answer Key Topic 1 Understand Addition and Subtraction 86.11
Answer:
Number of carrots are left = 4 or Four.

Explanation:
Number of carrots in all = 7 or Seven.
Number of carrots picked away = 3 or Three.
Number of carrots are left = Number of carrots in all – Number of carrots picked away
= 7 – 3
= 4 or Four.
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.9 Construct Arguments-Use cubes or draw a picture. Write an equation and solve-5

 

 

Set E
You can solve problems about comparing.
4 blue pens
3 yellow pens
How many more blue pens than yellow pens are there?
Envision Math Common Core 1st Grade Answer Key Topic 1 Understand Addition and Subtraction 86.12

Answer:
There are 1 more blue pens than yellow pens.

Explanation:
Number of yellow pens = 3 or Three.
Number of blue pens = 4 or Four.
Difference = Number of blue pens – Number of yellow pens
= 4 – 3
= 1 or One.
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.9 Construct Arguments-Set E

Use cubes or draw a picture. Write an equation and solve.

Question 6.
4 black pens and I red pen
How many more black pens than red pens?
Envision Math Common Core 1st Grade Answer Key Topic 1 Understand Addition and Subtraction 86.13

Answer:
There are 3 more black pens than red pens.

Explanation:
Number of black pens = 4 or Four.
Number of red pens = 1 or One.
Difference = Number of black pens – Number of red pens
= 4 – 1
= 3 or Three.
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.9 Construct Arguments-Set E-6

 

 

Question 7.
3 baseballs and 7 soccer balls
How many fewer baseballs than soccer balls?
Envision Math Common Core 1st Grade Answer Key Topic 1 Understand Addition and Subtraction 86.14
Answer:
4 fewer baseballs than soccer balls.

Explanation:
Number of baseballs = 3 or Three.
Number of soccer balls = 7 or Seven.
Difference = Number of soccer balls – Number of baseballs
= 7 – 3
= 4 or Four.
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.9 Construct Arguments-Set E-7

 

 

Set F

You can find a missing addend to solve problems.

Ty has 4 grapes.
He takes some more grapes.
Now he has 9 grapes
How many grapes did Ty take?
Envision Math Common Core 1st Grade Answer Key Topic 1 Understand Addition and Subtraction 86.15

Use cubes or draw a picture. Write an equation and solve.
Answer:
Number of grapes ty takes more = 5 or Five.

Explanation:
Number of grapes ty has = 4 or Four.
Total number of grapes ty has = 9 or Nine.
Number of grapes ty takes more = Total number of grapes ty has – Number of grapes ty has
= 9 – 4
= 5 or Five.
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.9 Construct Arguments-Set F

 

Question 8.
Ivy has 2 fish in a bowl. She adds some more fish. Now Ivy has 5 fish. How many fish did she add?
Envision Math Common Core 1st Grade Answer Key Topic 1 Understand Addition and Subtraction 86.16
Answer:
Number of fishes Ivy has added = 3 or Three.

Explanation:
Number of fishes Ivy has in a bowl = 2 or Two.
Total number of fishes Ivy has in a bowl = 5 or Five.
Number of fishes Ivy has added = Total number of fishes Ivy has in a bowl – Number of fishes Ivy has in a bowl
= 5 – 2
= 3 or Three.
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.9 Construct Arguments-Set F-9

 

Set G
You can add or subtract to find a missing part.

Tom has 9 shirts.
He has 4 red shirts.
The rest are blue.
How many blue shirts does Tom have?
Envision Math Common Core 1st Grade Answer Key Topic 1 Understand Addition and Subtraction 86.17

Use cubes or draw a picture. Write an equation and solve.
Answer:
Number of blue shirts Tom has = Total number of shirts Tom has -Number of red shirts Tom has
= 9 – 4
= 5 or Five.

Explanation:
Total number of shirts Tom has = 9 or Nine.
Number of red shirts Tom has = 4 or Four.
Number of blue shirts Tom has = Total number of shirts Tom has -Number of red shirts Tom has
= 9 – 4
= 5 or Five.
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.9 Construct Arguments-Set G

Question 9.
Gigi has 8 pairs of shoes. 4 pairs are tennis shoes. The rest are sandals. How many pairs are sandals?
Envision Math Common Core 1st Grade Answer Key Topic 1 Understand Addition and Subtraction 86.18
Answer:
Number of pair of sandals Gigi has = 4 or Four.

Explanation:
Total number of pairs of shoes Gigi has = 8 or Eight.
Number of pairs of tennis shoes Gigi has = 4 or Four.
Number of pair of sandals Gigi has = Total number of pairs of shoes Gigi has – Number of pairs of tennis shoes Gigi has
= 8 – 4
= 4 or Four.
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.9 Construct Arguments-Set G-9

 

 

Set H

Thinking Habits
Construct Arguments
How can I use math to explain my work?
Is my explanation clear?
Envision Math Common Core 1st Grade Answer Key Topic 1 Understand Addition and Subtraction 86.19

Answer:
You can use math in easy and simplify the calculations of the problem to explain your work.
Yes, your explanation is clear and easy.

Explanation:
Using math helps in making easy calculations and understand to solve the problem in an easy way.

 

 

Solve. Use pictures, numbers, or words to explain.
Question 10.
Luc has 8 fish.
He gives away 4 fish.
How many fish does Luc have left?
Answer:
Number of fishes Luc has left = 4 or Four.

Explanation:
Total number of fishes Luc has = 8 or Eight.
Number of fishes Luc gives away = 4 or Four.
Number of fishes Luc has left = Total number of fishes Luc has – Number of fishes Luc gives away
= 8 – 4
= 4 or Four.
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.9 Construct Arguments-Set G-10

 

 

Topic 1 Assessment Practice

Question 1.
There are 8 penguins.
Some go inside the cave.
Some stay outside.
Match the number of penguins inside the cave with the number of penguins outside.
Envision Math Common Core 1st Grade Answer Key Topic 1 Understand Addition and Subtraction 86.20
Envision Math Common Core 1st Grade Answer Key Topic 1 Understand Addition and Subtraction 86.21
Answer:
Number of penguins inside the cave = 4 or Four.
Number of penguins inside the cave = 5 or Five.

Explanation:
Total number of penguins  = 8 or Eight.
Total number of penguins  =  Number of penguins  inside the cave + Number of penguins outside the cave
=> 8 = ?? + ??
=> 8 = 4 + 5
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.9 Construct Arguments-Topic 1 Assessment Practice-1

 

Question 2.
Sage had 10 peppers. She cooks 3 of them. How many peppers are left?
Envision Math Common Core 1st Grade Answer Key Topic 1 Understand Addition and Subtraction 86.23
Write a subtraction equation to solve.
Envision Math Common Core 1st Grade Answer Key Topic 1 Understand Addition and Subtraction 86.24
Answer:
Number of peppers left = 7 or Seven.

Explanation:
Number of peppers Sage had = 10 or Ten.
Number of peppers Sage had cooked = 3 or Three.
Number of peppers left = Number of peppers Sage had – Number of peppers Sage had cooked
= 10 – 3
= 7 or Seven.
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.9 Construct Arguments-Topic 1 Assessment Practice-2

 

 

Question 3.
Sara has 5 green beads and 3 red beads. How many beads does she have in all?
Envision Math Common Core 1st Grade Answer Key Topic 1 Understand Addition and Subtraction 86.25
Write an addition equation to solve.
Envision Math Common Core 1st Grade Answer Key Topic 1 Understand Addition and Subtraction 86.26
Answer:
Total number of beads Sara has in all = 7 or Seven.

Explanation:
Number of beads Sara has = 10 or Ten.
Number of beads Sara has = 3 or Three.
Total number of beads Sara has in all  = Number of beads Sara has – Number of beads Sara has
= 10 – 3
= 7 or Seven.
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.9 Construct Arguments-Topic 1 Assessment Practice-3

 

 

Question 4.
Trina has 8 markers. Then she gives 5 markers to David.
Envision Math Common Core 1st Grade Answer Key Topic 1 Understand Addition and Subtraction 86.27
Which equation shows how many markers Trina has left?
A. 7 – 2 = 5
B. 7 – 3 = 4
C. 8 – 5 = 3
D. 9 – 3 = 6
Answer:
Number of markers Trina has left = 3 or Three.
C. 8 – 5 = 3

Explanation:
Total number of markers Trina has = 8 or Eight.
Number of markers given to David = 5 or Five.
Number of markers Trina has left =Total number of markers Trina has – Number of markers given to David
= 8 – 5
= 3 or Three.
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.9 Construct Arguments-Topic 1 Assessment Practice-4

 

 

Question 5.
George had 7 postcards. Then he gets some more. Now he has 9 postcards.
Envision Math Common Core 1st Grade Answer Key Topic 1 Understand Addition and Subtraction 86.28
Which equation does NOT describe the story?
A. 7 + 2 = 9
B. 6 + 3 = 9
C. 9 – 7 = 2
D. 9 – 2 = 7
Answer:
B. 6 + 3 = 9 does NOT describe the story.

Explanation:
Number of postcards George had = 7 or Seven.
Total number of postcards now he has = 9 or Nine.
Equation: A:
Number of postcards George had + Number of postcards George gets more  = Total number of postcards now he has
=> 7 + 2
= 9 or Nine.

Equation: C:
Number of postcards George gets more = Total number of postcards now he has – Number of postcards George had
= 9 – 7
= 2 or Two.

Equation: D:
Total number of postcards now he has – Number of postcards George gets more = Number of postcards George had
= 9 – 2
= 7 or Seven.
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.9 Construct Arguments-Topic 1 Assessment Practice-5

 

 

Question 6.
Dante has 5 books. He wants to have 7 books. How many more books does Dante need to have 7 in all?
Envision Math Common Core 1st Grade Answer Key Topic 1 Understand Addition and Subtraction 86.29

Answer:
Number of books he needs more to have 7 in all = 2 or Two.
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.9 Construct Arguments-Topic 1 Assessment Practice-6..

Explanation:
Number of books Dante has = 5 or Five.
Number of books he want to have = 7 or Seven.
Number of books he needs more to have 7 in all = Number of books he want to have – Number of books Dante has
= 7 – 5
= 2 or Two.
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.9 Construct Arguments-Topic 1 Assessment Practice-6

 

 

Question 7.
Lucy and Ellie have 6 cubes in all.
Ellie has 5 cubes.
Envision Math Common Core 1st Grade Answer Key Topic 1 Understand Addition and Subtraction 86.30
How many cubes does Lucy have?
Choose three equations that show the story.
Envision Math Common Core 1st Grade Answer Key Topic 1 Understand Addition and Subtraction 86.31
Answer:
Number of cubes Lucy has = 1 or one.
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.9 Construct Arguments-Topic 1 Assessment Practice-7

Explanation:
Equation:1:
Number of cubes Lucy and Ellie have in all = 6 or Six.
Number of cubes Ellie has = 5 or Five.
Number of cubes Lucy has = Number of cubes Lucy and Ellie have in all – Number of cubes Ellie has
= 6 – 5
= 1 or one.
Equation:2:
Number of cubes Lucy and Ellie have in all + Number of cubes Lucy has = Number of cubes Lucy and Ellie have in all
= 5 + 1
= 6 or Six.
Equation:3:
Number of cubes Lucy and Ellie have in all – Number of cubes Ellie has = Number of cubes Lucy has
= 6-1
= 5 or Five.

Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.9 Construct Arguments-Topic 1 Assessment Practice-7

 

Question 8.
Trina has 6 ribbons. Julie has 2 ribbons. What could happen for them to have the same number of ribbons?
A. Julie gives I of her ribbons to Trina.
B. Trina gives I of her ribbons to Julie.
C. Trina gives 2 of her ribbons to Julie.
D. Trina gives 4 of her ribbons to Julie.
Envision Math Common Core 1st Grade Answer Key Topic 1 Understand Addition and Subtraction 86.32
Answer:
Number of ribbons them to have the same number = 4 or Four.
D. Trina gives 4 of her ribbons to Julie.

Explanation:
Number of ribbons Trina has = 6 or Six.
Number of ribbons Julie has = 2 or Two.
Number of ribbons them to have the same number = Number of ribbons Trina has – Number of ribbons Julie has
= 6 – 2
= 4 or Four.
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.9 Construct Arguments-Topic 1 Assessment Practice-8

Question 9.
Draw the missing cubes on the mat.
Then write a subtraction equation that shows the story.
Owen has 5 blocks. He gives I to Jordan.
How many blocks does Owen have left?
Envision Math Common Core 1st Grade Answer Key Topic 1 Understand Addition and Subtraction 86.33
Envision Math Common Core 1st Grade Answer Key Topic 1 Understand Addition and Subtraction 86.34

Answer:
Number of blocks Owen have left = 4 or Four.

Explanation:
Number of blocks Owen has = 5 or Five.
Number of blocks Own gives to Jordan = 1 or One.
Number of blocks Owen have left = Number of blocks Owen has – Number of blocks Own gives to Jordan
= 5 – 1
= 4 or Four.
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.9 Construct Arguments-Topic 1 Assessment Practice-9

 

Question 10.
Hannah has 9 flowers. Carrie has 6 flowers. Which equation shows how many fewer flowers Carrie has than Hannah?
Envision Math Common Core 1st Grade Answer Key Topic 1 Understand Addition and Subtraction 86.35
Envision Math Common Core 1st Grade Answer Key Topic 1 Understand Addition and Subtraction 86.40
Answer:
Number of fewer flowers Carrie has than Hannah = 3 or Three.
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.9 Construct Arguments-Topic 1 Assessment Practice-10..

Explanation:
Number of flowers Hannah has = 9 or Nine.
Number of flowers Carrie has = 6 or Six.
Number of fewer flowers Carrie has than Hannah = Number of flowers Hannah has – Number of flowers Carrie has
= 9 – 6
= 3 or Three.
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.9 Construct Arguments-Topic 1 Assessment Practice-10

Question 11.
Laura has 7 pears.
She wants to keep 2 pears for herself and give one to each of 6 friends.
Will Laura have enough pears?
Use pictures and words to explain.
Answer:
Laura is not having enough pears to give to her friends.
Number of pears left with her are five, which are less to give to her 6 friends each.

Explanation:
Total number of pears Laura has = 7 or Seven.
Number of pears She wants to keep for herself = 2 or Two.
Number of pears left =  Total number of pears Laura has – Number of pears She wants to keep for herself
= 7 or 2
= 5 or Five.
Number of pears She give one to each of 6 friends.
=> Number of pears required to be with her to give to her friends = 1 × 6
=> 6 or Six.
Number of pears left with her are 5, which are less to give to her friends.
Therefore, Laura does not have enough pears to give to her friends.
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.9 Construct Arguments-Topic 1 Assessment Practice-11

 

Question 12.
Nikki has 8 tennis balls. Thomas has 6 tennis balls. Which equation shows how many more tennis Nikki has than Thomas?
Envision Math Common Core 1st Grade Answer Key Topic 1 Understand Addition and Subtraction 86.36
Envision Math Common Core 1st Grade Answer Key Topic 1 Understand Addition and Subtraction 86.37
Answer:
Number of more tennis balls Nikki has than Thomas = 2 or Two.
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.9 Construct Arguments-Topic 1 Assessment Practice-12..

Explanation:
Number of tennis balls Nikki has = 8 or Eight
Number of tennis balls Thomas has = 6 or Six.
Number of more tennis balls Nikki has than Thomas = Number of tennis balls Nikki has – Number of tennis balls Thomas has
= 8 – 6
= 2 or Two.
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Lesson 1.9 Construct Arguments-Topic 1 Assessment Practice-12

Topic 1 Assessment Practice

Skating Ribbons
Marta is an ice skater.
She wins ribbons for her skating.
Envision Math Common Core 1st Grade Answer Key Topic 1 Understand Addition and Subtraction 86.38

Question 1.
Marta wins 2 blue ribbons. She wins 4 red ribbons.
How many ribbons does she win in all?
____ ribbons
Answer:
Number of ribbons Marta wins in all = 6 or Six.
_6__ ribbons.

Explanation:
Number of blue ribbons Marta wins = 2 or Two.
Number of red ribbons Marta wins = 4 or Four.
Number of ribbons Marta wins in all = Number of blue ribbons Marta wins + Number of red ribbons Marta wins
= 2 + 4
= 6 or Six.
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Topic 1 Assessment Practice-Skating Ribbons-1

 

Question 2.
Marta has 4 red ribbons.
She wins some more red ribbons.
Now she has 7 red ribbons.
How many more red ribbons did Marta win? ___ more red ribbons
Write an equation to show why your answer is correct.
Answer:
3 more red ribbons Marta wins.
_3__ more red ribbons.

Explanation:
Number of red ribbons Marta has = 4 or Four.
Total number of red ribbons Marta has now = 7 or Seven.
Number of red ribbons Marta wins more = Total number of red ribbons Marta has now – Number of red ribbons Marta has
= 7 – 4
= 3 or Three.
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Topic 1 Assessment Practice-Skating Ribbons-2

 

 

Question 3.
Marta has 8 yellow ribbons. She put some on her door. She puts the rest on her wall.
Envision Math Common Core 1st Grade Answer Key Topic 1 Understand Addition and Subtraction 86.39
Write two different addition equations to show two ways she can put the ribbons on her door or on her wall.
Answer:
Equation:1:
Number of yellow ribbons She puts on her door = 4 or Four.
Number of yellow ribbons She puts on her wall = 4 or Four.

Equation:2:
Number of yellow ribbons She puts on her door = 5 or Five.
Number of yellow ribbons She puts on her wall = 3 or Three.

Explanation:
Equation:1:
Number of yellow ribbons Marta has = 8 or Eight.
Number of yellow ribbons Marta has = Number of yellow ribbons She puts on her door + Number of yellow ribbons She puts on her wall
= 4+ 4
= 8 or Eight.

Equation:2:
Number of yellow ribbons Marta has = 8 or Eight.
Number of yellow ribbons Marta has = Number of yellow ribbons She puts on her door + Number of yellow ribbons She puts on her wall
= 5 + 3
= 8 or Eight.
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Topic 1 Assessment Practice-Skating Ribbons-3

 

Question 4.
Marta has 8 yellow ribbons.
She has 2 blue ribbons.
How many more yellow ribbons than blue ribbons does Marta have?
___ more yellow ribbons
Answer:
6 more yellow ribbons than blue ribbons Marta has.
_6__ more yellow ribbons.

Explanation:
Number of yellow ribbons Marta has = 8 or Eight.
Number of blue ribbons Marta has = 2 or Two.
Difference = Number of yellow ribbons Marta has – Number of blue ribbons Marta has
= 8 – 2
= 6 or Six.
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Topic 1 Assessment Practice-Skating Ribbons-4

 

Question 5.
Explain why your answer to item 4 is correct. Use numbers, pictures, or words.
Answer:
My answer is correct to item 4 because:
Difference of more yellow ribbons than blue ribbons Marta has + Number of blue ribbons Marta has
=> 6 + 2
=> 8 = Number of yellow ribbons Marta has.

Explanation:
My answer is correct to item 4 because:
Difference of more yellow ribbons than blue ribbons Marta has + Number of blue ribbons Marta has
=> 6 + 2
=> 8 = Number of yellow ribbons Marta has.
Envision-Math-Common-Core-1st-Grade-Answers-Key-Topic-1-Understand-Addition-and-Subtraction-Topic 1 Assessment Practice-Skating Ribbons-5

Leave a Reply

Your email address will not be published. Required fields are marked *