Envision Math Common Core 1st Grade Answers Key Topic 10 Use Models and Strategies to Add Tens and Ones

Envision Math Common Core Grade 1 Answer Key Topic 10 Use Models and Strategies to Add Tens and Ones 1

enVision STEM Project: Watch the Stars

Find Out Talk to friends and relatives about stars. Discuss why the stars you see in the sky change from night to night.
Journal: Make a Book Show what you found out. In your book, also:

  • Draw the stars you can see from where you live.
  • Make up and solve addition problems about the stars.

Review What You Know

Vocabulary

Question 1.
Circle the digit that shows how many ones.
91
Answer:

Question 2.
Circle the digit that shows how many tens.
13
Answer:

Question 3.
Circle the symbol that tells you add.
+ – =
Answer:

Understanding Addition

Question 4.
Write an addition equation to match the picture.
Envision Math Common Core Grade 1 Answer Key Topic 10 Use Models and Strategies to Add Tens and Ones 1.1
Answer:

Question 5.
Noah mows 7 lawns. Mari mows 13 lawns. How many lawns did the two friends mow in all? Write an addition equation to solve.
__ + __ = ____
Answer:

Hundred Chart

Question 6.
Fill in the missing numbers on the part of the hundred chart.
Envision Math Common Core Grade 1 Answer Key Topic 10 Use Models and Strategies to Add Tens and Ones 2
Answer:

pick a Project

PROJECT 10A

Has anyone ever called you the wrong name?
Project: Make a Manatee Facts Book
Envision Math Common Core Grade 1 Answer Key Topic 10 Use Models and Strategies to Add Tens and Ones 3

PROJECT 10B
Have you ever aimed at a target?
Project: Play a Target Toss Game
Envision Math Common Core Grade 1 Answer Key Topic 10 Use Models and Strategies to Add Tens and Ones 4

PROJECT 10C
What is as colorful as a butterfly?
Project: Make a Leaf and Egg Model
Envision Math Common Core Grade 1 Answer Key Topic 10 Use Models and Strategies to Add Tens and Ones 5

PROJECT 10D
What would life be like without bones?
Project: Write and Draw an Octopus Story
Envision Math Common Core Grade 1 Answer Key Topic 10 Use Models and Strategies to Add Tens and Ones 6

Lesson 10.1 Add Tens Using Models

Solve & Share

How are these addition problems alike? Talk to a partner about how you can use the first sum to help you find the second.

Envision Math Common Core Grade 1 Answer Key Topic 10 Use Models and Strategies to Add Tens and Ones 7

Visual Learning Bridge
Envision Math Common Core Grade 1 Answer Key Topic 10 Use Models and Strategies to Add Tens and Ones 8

Convince Me!
How is adding 6 + 3 like adding 60 + 30?

Guided Practice

Write the numbers to complete each equation.

Question 1.
Envision Math Common Core Grade 1 Answer Key Topic 10 Use Models and Strategies to Add Tens and Ones 9
Answer:

Question 2.
Envision Math Common Core Grade 1 Answer Key Topic 10 Use Models and Strategies to Add Tens and Ones 10
Answer:

Independent Practice

Write the numbers to complete each equation.

Question 3.
Envision Math Common Core Grade 1 Answer Key Topic 10 Use Models and Strategies to Add Tens and Ones 11
Answer:

Question 4.
Envision Math Common Core Grade 1 Answer Key Topic 10 Use Models and Strategies to Add Tens and Ones 12
Answer:

Question 5.
Envision Math Common Core Grade 1 Answer Key Topic 10 Use Models and Strategies to Add Tens and Ones 13
Answer:

Question 6.
Envision Math Common Core Grade 1 Answer Key Topic 10 Use Models and Strategies to Add Tens and Ones 14
Answer:

Question 7.
Envision Math Common Core Grade 1 Answer Key Topic 10 Use Models and Strategies to Add Tens and Ones 15
Answer:

Question 8.
Envision Math Common Core Grade 1 Answer Key Topic 10 Use Models and Strategies to Add Tens and Ones 16
Answer:

Question 9.
Envision Math Common Core Grade 1 Answer Key Topic 10 Use Models and Strategies to Add Tens and Ones 17
Answer:

Question 10.
Envision Math Common Core Grade 1 Answer Key Topic 10 Use Models and Strategies to Add Tens and Ones 18
Answer:

Question 11.
Envision Math Common Core Grade 1 Answer Key Topic 10 Use Models and Strategies to Add Tens and Ones 19
Answer:

Problem Solving
Add tens to solve. Use place-value blocks if needed.

Question 12.
Make Sense Alex and Annie each have 5 boxes of crayons. Each box has 10 crayons.
How many crayons do Alex and Annie have in all?
___ + ___ = ___
___ crayons
Answer:

Question 13.
Make Sense Becky and Dan buy some bottles of juice. Becky buys 6 bottles. Dan buys 2 bottles. Each bottle of juice is enough for 10 people. How many people do Dan and Becky have enough juice for?
___ + __ = ___
___ people
Answer:

Question 14.
Higher Order Thinking Bree says that she knows 4 + 3 = 7, so she also knows that 30 + 40 = 70. Is she correct? Explain how you know.
Answer:

Question 15.
Assessment Practice Which equation matches the picture?
A. 2 + 3 = 5
B. 3 + 2 = 5
C. 20+ 3 = 23
D. 20 + 30 = 50
Envision Math Common Core Grade 1 Answer Key Topic 10 Use Models and Strategies to Add Tens and Ones 20
Answer:

Lesson 10.2 Mental Math: Ten More Than a Number

Solve & Share

Solve each problem. What pattern do you see in the totals?

Envision Math Common Core Grade 1 Answer Key Topic 10 Use Models and Strategies to Add Tens and Ones 21

Visual Learning Bridge
Envision Math Common Core Grade 1 Answer Key Topic 10 Use Models and Strategies to Add Tens and Ones 22

Convince Me!
Explain how you can use mental math to add 10 to 47.

Guided Practice

Use mental math to solve the problems.

Question 1.
Envision Math Common Core Grade 1 Answer Key Topic 10 Use Models and Strategies to Add Tens and Ones 23
Answer:

Question 2.
Envision Math Common Core Grade 1 Answer Key Topic 10 Use Models and Strategies to Add Tens and Ones 24
Answer:

Independent Practice

Use mental math to solve each equation.

Question 3.
Envision Math Common Core Grade 1 Answer Key Topic 10 Use Models and Strategies to Add Tens and Ones 25
58 + 10 = ___
Answer:

Question 4.
Envision Math Common Core Grade 1 Answer Key Topic 10 Use Models and Strategies to Add Tens and Ones 26
44 + 10 = ___
Answer:

Question 5.
Envision Math Common Core Grade 1 Answer Key Topic 10 Use Models and Strategies to Add Tens and Ones 27
35 + 10 = ___
Answer:

Question 6.
10 + 72 = ___
Answer:

Question 7.
87 + 10 = ___
Answer:

Question 8.
31 + 10 = ___
Answer:

Question 9.
18 + 10 = ___
Answer:

Question 10.
10 + 26 = ___
Answer:

Question 11.
9 + 10 = ___
Answer:

Question 12.
Number Sense Winnie used place-value blocks to show 29 + 10. She said the answer is 30. Is Winnie correct? Explain how you know.
Envision Math Common Core Grade 1 Answer Key Topic 10 Use Models and Strategies to Add Tens and Ones 28.1
Answer:

Problem Solving

Use mental math to solve the problems below.

Question 13.
Reasoning Sam makes 15 dollars mowing lawns one day. He makes 10 dollars the next day. How many dollars did Sam make in all?
____ dollars
Answer:

Question 14.
Reasoning Tess solves 22 math problems. Then she solves 10 more math problems. How many math problems did Tess solve in all?
Envision Math Common Core Grade 1 Answer Key Topic 10 Use Models and Strategies to Add Tens and Ones 28.2
___ math problems
Answer:

Question 15.
Higher Order Thinking Roger collects 75 cans. Ella collects some cans. Roger and Ella have 85 cans together. How many cans did Ella collect?
___ cans

Question 16.
Assessment Practice Match each pair of addends with their sum.
Envision Math Common Core Grade 1 Answer Key Topic 10 Use Models and Strategies to Add Tens and Ones 28.3
Answer:

Lesson 10.3 Add Tens and Ones Using a Hundred Chart

Solve & Share
Use a hundred chart to find these sums. 8 + 40 = ? 30 + 40 = ? 80 + 12 = ?
Show your work and tell how you found each sum.
Envision Math Common Core Grade 1 Answer Key Topic 10 Use Models and Strategies to Add Tens and Ones 28.4

Visual Learning Bridge
Envision Math Common Core Grade 1 Answer Key Topic 10 Use Models and Strategies to Add Tens and Ones 28.5

Convince Me!
How could you use the hundred chart to find the sum of 6 and 50?

Guided Practice

Use the part of the hundred chart to add.

Question 1.
2 + 12 = 14

Question 2.
5 + 40 = ___
Answer:

Question 3.
13 + 20 = ___
Answer:

Envision Math Common Core Grade 1 Answer Key Topic 10 Use Models and Strategies to Add Tens and Ones 28.56

Question 4.
10 + 31 = ___
Answer:

Question 5.
32 + 6 = ___

Independent Practice

Use the hundred chart to add.

Envision Math Common Core Grade 1 Answer Key Topic 10 Use Models and Strategies to Add Tens and Ones 28.6

Question 6.
7 + 60 = ____
Answer:

Question 7.
33 + 20 = ___
Answer:

Question 8.
20 + 18 = ___
Answer:

Question 9.
5 + 13 = ___
Answer:

Question 10.
3 + 26 = ___
Answer:

Question 11.
1 + 41 = ___
Answer:

Question 12.
4 + 32 = ___
Answer:

Question 13.
56 + 2 = ___
Answer:

Question 14.
10 + 85 = __
Answer:

Question 15.
7 + 12 = ___
Answer:

Question 16.
50 + 13 = ___
Answer:

Question 17.
71 + 5 = ___
Answer:

Question 18.
Higher Order Thinking Sue had some stickers in a book. She bought 30 more stickers. Now she has 36 stickers in her book. How many stickers did Sue have in the book at the start?
_____ stickers
Envision Math Common Core Grade 1 Answer Key Topic 10 Use Models and Strategies to Add Tens and Ones 28.9

Problem Solving

Use the hundred chart to solve each problem below.

Envision Math Common Core Grade 1 Answer Key Topic 10 Use Models and Strategies to Add Tens and Ones 28.10

Question 19.
Use Tools Some hens lay 40 eggs. Then they lay 45 more eggs. How many eggs did the hens lay in all?
___ eggs
Answer:

Question 20.
Use Tools 22 students are at the book fair. More students came to the book fair later. There are 72 students in all at the book fair. How many students came later?
____ students
Answer:

Question 21.
Higher Order Thinking Write a number story for 3 + 42.
Answer:

Question 22.
Assessment Practice Use the hundred chart. Which equations show the correct sum for 50 + 8? Choose two that apply.
Envision Math Common Core Grade 1 Answer Key Topic 10 Use Models and Strategies to Add Tens and Ones 28.30 8 + 50 = 85
Envision Math Common Core Grade 1 Answer Key Topic 10 Use Models and Strategies to Add Tens and Ones 28.30 50 + 8 = 13
Envision Math Common Core Grade 1 Answer Key Topic 10 Use Models and Strategies to Add Tens and Ones 28.30 8 + 50 = 58
Envision Math Common Core Grade 1 Answer Key Topic 10 Use Models and Strategies to Add Tens and Ones 28.30 50 + 8 = 58

Lesson 10.4 Add Tens and Ones Using an Open Number LineName

Solve & Share

Use the open number lines to find the sums.
43 + 6 = ? 5+ 19 = ? 10+ 32 = ?
Envision Math Common Core Grade 1 Answer Key Topic 10 Use Models and Strategies to Add Tens and Ones 30.5

Visual Learning Bridge
Envision Math Common Core Grade 1 Answer Key Topic 10 Use Models and Strategies to Add Tens and Ones 30.6

Convince Me!
Think about the problem 20 + 17. Would it be easier to start with 20 or 17 on the number line to solve the problem?

Guided Practice
Add using the number lines.

Question 1.
Envision Math Common Core Grade 1 Answer Key Topic 10 Use Models and Strategies to Add Tens and Ones 30.7
Answer:

Question 2.
Envision Math Common Core Grade 1 Answer Key Topic 10 Use Models and Strategies to Add Tens and Ones 30.8
Answer:

Question 3.
Envision Math Common Core Grade 1 Answer Key Topic 10 Use Models and Strategies to Add Tens and Ones 30.9
11 + 8 = ___
Answer:

Question 4.
Envision Math Common Core 1st Grade Answers Topic 10 Use Models and Strategies to Add Tens and Ones 30.10
40 + 16 = ___
Answer:

Question 5.
Envision Math Common Core 1st Grade Answers Topic 10 Use Models and Strategies to Add Tens and Ones 30.11
48 + 20 = ___
Answer:

Question 6.
Envision Math Common Core 1st Grade Answers Topic 10 Use Models and Strategies to Add Tens and Ones 30.12
22 + 7 = ___
Answer:

Question 7.
Higher Order Thinking Write an addition equation using a two-digit and one-digit number. Then solve by showing your work on the number line.
Envision Math Common Core 1st Grade Answers Topic 10 Use Models and Strategies to Add Tens and Ones 30.13
Answer:

Problem Solving

Solve the problems below.

Question 8.
Use Tools Danny writes 20 pages of his paper on Monday. He writes 32 pages on Tuesday. How many pages did Danny write in all? Use the number line to solve.
Envision Math Common Core 1st Grade Answers Topic 10 Use Models and Strategies to Add Tens and Ones 30.14
20 + 32 = ___ ___ pages
Answer:

Question 9.
Use Tools Last year, Leah watched 41 movies. This year, she has watched 30 movies. How many movies has Leah watched in all? Use the number line to solve.
Envision Math Common Core 1st Grade Answers Topic 10 Use Models and Strategies to Add Tens and Ones 30.15
41 + 30 = ___ ___ movies

Question 10.
Higher Order Thinking Explain how you would solve 57 + 7 on a number line.
Answer:

Question 11.
Assessment Practice
Add 60 + 26 on a number line. Show your work.
Envision Math Common Core 1st Grade Answers Topic 10 Use Models and Strategies to Add Tens and Ones 30.16
60 + 26 = ___
Answer:

Lesson 10.5 Add Tens and Ones Using Models

Solve & Share

Maddy has 50 stickers. Jill gives Maddy 5 more stickers. Use place-value blocks to show how many stickers Maddy has now. Then use numbers and pictures to show your work.
Envision Math Common Core 1st Grade Answers Topic 10 Use Models and Strategies to Add Tens and Ones 30.17

Visual Learning Bridge
Envision Math Common Core 1st Grade Answers Topic 10 Use Models and Strategies to Add Tens and Ones 30.18

Convince Me!
Could you count on by 10s to add 21 + 20?

Guided Practice
Use blocks to add. Then draw what you did.

Question 1.
Envision Math Common Core 1st Grade Answers Topic 10 Use Models and Strategies to Add Tens and Ones 30.19
Answer:

Question 2.
16 + 30 = __
Answer:

Question 3.
32 + 20 = ___
Answer:

Question 4.
33 + 6 = ___
Answer:

Independent Practice

Add. Draw blocks to show your work.

Question 5.
37 + 2 = ___
Answer:

Question 6.
21 + 40 = ___
Answer:

Question 7.
42 + 10 = ___
Answer:

Question 8.
4 + 33 = ___
Answer:

Question 9.
50 + 14 = ___
Answer:

Envision Math Common Core 1st Grade Answers Topic 10 Use Models and Strategies to Add Tens and Ones 30.20

Envision Math Common Core 1st Grade Answers Topic 10 Use Models and Strategies to Add Tens and Ones 30.200
Look for a pattern to help you find the missing numbers.

Question 10.
Algebra Write the missing numbers. Then write the last addition problem in the pattern.
Envision Math Common Core 1st Grade Answers Topic 10 Use Models and Strategies to Add Tens and Ones 30.21
Answer:

Problem Solving

Write an equation to solve each problem below. Use blocks to help if needed.

Question 11.
Model Jamal has 32 coins in his piggy bank. Jamal’s dad gives him 4 more coins. How many coins does Jamal have now?
___ + ___ = ___
__ coins
Answer:

Question 12.
Model Julie sells 18 muffins on Monday. She sells 20 muffins on Friday. How many muffins did Julie sell in all?
___ + __ = ___
___ muffins
Answer:

Question 13.
Higher Order Thinking Jake has 9 marbles. He gets some more marbles. Now Jake has 79 marbles. How many marbles did Jake get? Draw a picture to solve.
Envision Math Common Core 1st Grade Answers Topic 10 Use Models and Strategies to Add Tens and Ones 30.22
Answer:

Question 14.
Assessment Practice Which is the sum for 40 + 37?
A 47
B 57
C 67
D 77
Answer:

Lesson 10.6 Make a Ten to Add

Solve & Share

What strategy can you use to find 8 + 5?
How can you use the sum for 8 + 5 to help you find 28 + 5? Show your work and be ready to explain your thinking.

Envision Math Common Core 1st Grade Answers Topic 10 Use Models and Strategies to Add Tens and Ones 40.1

Visual Learning Bridge
Envision Math Common Core 1st Grade Answers Topic 10 Use Models and Strategies to Add Tens and Ones 40.2

Convince Me!
When you add two numbers, how do you know if you can make a 10?

Guided Practice
Draw blocks and make a 10 to add.

Question 1.
Find 37 + 7.
Envision Math Common Core 1st Grade Answers Topic 10 Use Models and Strategies to Add Tens and Ones 40.3
Answer:

Independent Practice

Draw blocks and make a 10 to add.

Question 2.
17 + 7
Think: 17 + ___ = 20
So, break apart 7 into ___ + ___.
20 + ___ = ___
So, 17 + 7 = ___
Answer:

Question 3.
38 +4
Think: 38 + ___ = 40
So, break apart 4 into __ + ___
40 + ___ = ___
So, 38 + 4 = __
Envision Math Common Core 1st Grade Answers Topic 10 Use Models and Strategies to Add Tens and Ones 50.1

Question 4.
42 + 8 = ___
Answer:

Question 5.
29 +5 = ___
Answer:

Algebra Write each missing number. Use place-value blocks if you need to.

Question 6.
23 + Envision Math Common Core 1st Grade Answers Topic 10 Use Models and Strategies to Add Tens and Ones 50.2 = 32
Answer:

Question 7.
35 + Envision Math Common Core 1st Grade Answers Topic 10 Use Models and Strategies to Add Tens and Ones 50.2 = 40
Answer:

Problem Solving

Solve each problem below.

Question 8.
Model Jamie has 28 cards. His sister gives him 6 more cards. How many cards does Jamie have now? Draw blocks to show your work.
__ cards
Answer:

Question 9.
Model Lisa knits 15 scarves. Then she knits 8 more. How many scarves does Lisa knit in all? Draw blocks to show your work.
cards
___ scarves
Answer:

Question 10.
Higher Order Thinking Explain how to find 19 + 6. Use equations to show your thinking.
Answer:

Question 11.
Assessment Practice Explain how to use the make a 10 strategy to find 37 + 5.
Answer:

Lesson 10.7 Add Using Place Value

Solve & Share

Grace is solving 35 + 8. First she adds 35 + 5 = 40. What should she do next to find the answer? Draw a model to explain.

Envision Math Common Core 1st Grade Answers Topic 10 Use Models and Strategies to Add Tens and Ones 60.2

Visual Learning Bridge
Envision Math Common Core 1st Grade Answers Topic 10 Use Models and Strategies to Add Tens and Ones 60.3

Convince Me!
Do you need to make a 10 to add 23 + 15? How do you know?

Guided Practice
Add. Draw blocks to help.

Question 1.
Find 36 + 24.
6 + 4 = 10
30 + 20 = ___
So, 36 + 24 = ___
Answer:

Question 2.
Find 19 + 25.
9 + 5 = 14
10 + 20 = 30
So, 19 + 25 = ___
Answer:

Independent Practice

Add. Draw blocks or an open number line to help./

Question 3.
Find 19 + 42.
9 + 2 = ___
10 + 40 = ___
19 + 42 = ___
Answer:

Question 4.
Find 27 + 25.
7 + 5 = ___
20 + 20 = ___
27 + 25 = ___
Answer:

Add. You can draw blocks or an open number line to help.

Question 5.
37 + 33 = ___
Answer:

Question 6.
28 + 44 = ___

Question 7.
25 + 26 = ___
Answer:

Question 8.
56 + 33 = ___
Answer:

Problem Solving

Solve. You can draw blocks or an open number line to help you.

Question 9.
Reasoning Sara mows 15 lawns. Bill mows 12 lawns. How many lawns did they mow in all? Write an addition equation to show the problem.
__ lawns
Answer:

Question 10.
Reasoning Jon reads 24 pages. Then he reads 27 more pages. How many pages does he read in all? Write an addition equation to show the problem.
___ pages
Answer:

Question 11.
Higher Order Thinking Explain how to find 27 + 15 by adding the tens first. Use equations to show your thinking.
Answer:

Question 12.
Assessment Practice For which addition equations can you make a 10 to add? Choose two that apply.
Envision Math Common Core 1st Grade Answers Topic 10 Use Models and Strategies to Add Tens and Ones 60.8 12 + 29 = ?
Envision Math Common Core 1st Grade Answers Topic 10 Use Models and Strategies to Add Tens and Ones 60.8 61 +26 = ?
Envision Math Common Core 1st Grade Answers Topic 10 Use Models and Strategies to Add Tens and Ones 60.8 33 + 35 = ?
Envision Math Common Core 1st Grade Answers Topic 10 Use Models and Strategies to Add Tens and Ones 60.8 34 + 18 = ?

Lesson 10.8 Practice Adding Using Strategies

Solve & Share

A puzzle has 59 green pieces and 25 orange pieces. Solve 59 + 25 to find how many pieces in all. Use any of the strategies you have learned.

Envision Math Common Core 1st Grade Answers Topic 10 Use Models and Strategies to Add Tens and Ones 60.10

Visual Learning Bridge
Envision Math Common Core 1st Grade Answers Topic 10 Use Models and Strategies to Add Tens and Ones 60.11

Convince Me!
Why can you use different strategies to solve the same problem?

Guided Practice

Find each sum. Solve any way you choose. Draw or explain what you did.

Question 1.
37 + 24 = 61
Envision Math Common Core 1st Grade Answers Topic 10 Use Models and Strategies to Add Tens and Ones 60.12
Answer:

Question 2.
48 + 10 = ___
Answer:

Independent Practice

Find each sum. Solve any way you choose. Draw or explain what you did.

Question 3.
Envision Math Common Core 1st Grade Answers Topic 10 Use Models and Strategies to Add Tens and Ones 60.13
Answer:

Question 4.
Envision Math Common Core 1st Grade Answers Topic 10 Use Models and Strategies to Add Tens and Ones 60.14
Answer:

Question 5.
Envision Math Common Core 1st Grade Answers Topic 10 Use Models and Strategies to Add Tens and Ones 60.15
Answer:

Question 6.
Envision Math Common Core 1st Grade Answers Topic 10 Use Models and Strategies to Add Tens and Ones 60.16
Answer:

Problem Solving

Find each sum. Solve any way you choose.

Question 7.
Reasoning Lilly makes necklaces. She has 43 blue beads. She has 20 pink beads. How many beads does Lilly have in all?
___ beads
Answer:

Question 8.
Reasoning Jay has a hat collection. He has 27 hats from football teams. He has 33 hats from baseball teams. How many hats does Jay have in all?
___ hats
Answer:

Question 9.
Higher Order Thinking Connie’s soccer team has a bake sale. The team sells 18 banana muffins and 24 oat muffins. They sell 12 granola bars. How many muffins did Connie’s team sell? Draw a picture and write an equation to show your work.
___ muffins
Answer:

Question 10.
Assessment Practice Garret uses place-value blocks to show 53 + 18. Which of the following model this problem? Choose two that apply.
Envision Math Common Core 1st Grade Answers Topic 10 Use Models and Strategies to Add Tens and Ones 70.1
Answer:

Lesson 10.9 Model with Math

Solve & Share
Pam has 13 buttons. Julie gives her some more. Now Pam as 30 buttons. Use blocks or a number line to figure out how many buttons Julie gave Pam.
Envision Math Common Core 1st Grade Answers Topic 10 Use Models and Strategies to Add Tens and Ones 70.2

Thinking Habits
How can I use numbers and symbols to solve this problem? How can I use the math I know to show this problem?

Visual Learning Bridge
Envision Math Common Core 1st Grade Answer Key Topic 10 Use Models and Strategies to Add Tens and Ones 70.3

Convince Me!
If Miko has 23 green marbles and 30 blue marbles, how many marbles does he have in all? Draw a picture to solve the problem.

Guided Practice
Use drawings to show and solve the problem. Then write the equation.

Question 1.
Ellen has 27 stickers. Her brother gives her 26 stickers. How many stickers does Ellen have in all?
___ + ___= ___
Envision Math Common Core 1st Grade Answers Topic 10 Use Models and Strategies to Add Tens and Ones 70.4
Answer:

Independent Practice

Use drawings to show and solve the problem. Then write the equation.

Question 2.
Barry has 12 red cars. He has 14 blue cars. How many cars does Barry have in all?
___ + ___ = ___ cars
Answer:

Question 3.
Amy picks 18 roses. Roger picks 36 tulips. How many flowers do Amy and Roger pick in all?
___ + ___ = ___ flowers
Answer:

Question 4.
There are 16 apples in the bowl. George buys 15 more apples. How many apples are there in all?
__ + ___ = __ apples

Problem Solving

Performance Task

Stamp Collection
Manuel, Matt, and Jessica each have their own stamp collection.

Question 5.
Model Manuel has 18 stamps. Matt gives Manuel 30 stamps. Now how many stamps does Manuel have in all? Draw a picture to show the problem.
Answer:

Question 6.
Model Write an equation that matches the story.
Envision Math Common Core 1st Grade Answers Topic 10 Use Models and Strategies to Add Tens and Ones 77.1
Answer:

Question 7.
Explain Matt has 24 red stamps. He asks Jessica for enough red stamps to make 50 red stamps. Jessica gives him 25 red stamps. Did Jessica give Matt enough red stamps? Explain how you know using words or pictures.
Envision Math Common Core 1st Grade Answers Topic 10 Use Models and Strategies to Add Tens and Ones 77.2
Can you make a 10? Why or why not.
Answer:

Topic 10 Fluency Practice

Color these sums and differences. Leave the rest white.

Envision Math Common Core 1st Grade Answers Topic 10 Use Models and Strategies to Add Tens and Ones 77.5

Topic 10 Vocabulary Review

Understand Vocabulary

Question 1.
Use the models to add the tens.
Envision Math Common Core 1st Grade Answers Topic 10 Use Models and Strategies to Add Tens and Ones 77.6
___ tens + ___ tens = ___ tens
Answer:

Question 2.
Use the models to add the tens.
Envision Math Common Core 1st Grade Answers Topic 10 Use Models and Strategies to Add Tens and Ones 77.7
___ tens + ___ tens = ___ tens
Answer:

Question 3.
Find 19 + 12.
Add the ones. 9 + 2 = ___
Then add the tens. 10 + 10 = ___
Draw blocks to help. 19 + 12 = ___
Answer:

Use Vocabulary in Writing

Question 4.
Solve 20 + 6 using an open number line. Explain how you solved it using terms from the Word List.
Envision Math Common Core 1st Grade Answers Topic 10 Use Models and Strategies to Add Tens and Ones 77.9
Answer:

Topic 10 Reteaching

Set A

You can add groups of 10.
Envision Math Common Core 1st Grade Answers Topic 10 Use Models and Strategies to Add Tens and Ones 77.10

Write the numbers to complete each equation.

Question 1.
Envision Math Common Core 1st Grade Answers Topic 10 Use Models and Strategies to Add Tens and Ones 77.11
Answer:

Question 2.
Envision Math Common Core 1st Grade Answers Topic 10 Use Models and Strategies to Add Tens and Ones 77.12
Answer:

Set B

You can also use mental math to add 10. When you add 10, the tens digit goes up by 1. The ones digit stays the same.
Envision Math Common Core 1st Grade Answers Topic 10 Use Models and Strategies to Add Tens and Ones 77.13
Answer:

Use mental math to solve the problems below.

Question 3.
36 + 10 = ___
Answer:

Question 4.
53 + 10 = ___
Answer:

Question 5.
71 + 10 = ___
Answer:

Set C

You can use part of a hundred chart to add tens and ones.
3+ 40 = ?
Envision Math Common Core 1st Grade Answers Topic 10 Use Models and Strategies to Add Tens and Ones 80.1

Use the part of the hundred chart to add tens and ones.
Envision Math Common Core 1st Grade Answers Topic 10 Use Models and Strategies to Add Tens and Ones 80.2

Question 6.
4 + 50 = ___
Answer:

Question 7.
8 + 30 = ___
Answer:

Set D

You can use an open number line to add.
Envision Math Common Core 1st Grade Answers Topic 10 Use Models and Strategies to Add Tens and Ones 80.3

Use an open number line to add.

Question 8.
Envision Math Common Core 1st Grade Answers Topic 10 Use Models and Strategies to Add Tens and Ones 80.4
11 + 6 = ___
Answer:

Set E

You can use blocks to add tens to a number.

Envision Math Common Core 1st Grade Answers Topic 10 Use Models and Strategies to Add Tens and Ones 80.6

Add the tens and the ones. Use blocks to help you.

Question 9.
44 + 30 = ___
Answer:

Question 10.
20 + 5 = ___
Answer:

Question 11.
30 + 28 = ___
Answer:

Question 12.
19 + 60 = ___

Set F

Sometimes you can make 10 when you add.
Envision Math Common Core 1st Grade Answers Topic 10 Use Models and Strategies to Add Tens and Ones 80.7

Draw blocks and make a 10 to add.

Question 13.
33 + 9
Envision Math Common Core 1st Grade Answers Topic 10 Use Models and Strategies to Add Tens and Ones 80.8
Think: 33 + __ = 40
So, break apart 9 into ___ + ___.
40 + __ = ___
So, 33 + 9 = ___

Set G

You can draw blocks to help you add. First add the ones. Then add the tens.
Envision Math Common Core 1st Grade Answers Topic 10 Use Models and Strategies to Add Tens and Ones 80.9
There are 4 tens and 3 ones. 24 + 19 = 43

Add. Draw blocks to help.

Question 14.
Find 67 + 16.
7 + 6 = ___
60 + 10 = ___
67 + 16 = ___
Answer:

Set H

Thinking Habits
Model with Math

Can I use a drawing, diagram, table, or graph to model the problem? Can I write an equation to show the problem?
Envision Math Common Core 1st Grade Answers Topic 10 Use Models and Strategies to Add Tens and Ones 90.1

Use drawings to show and solve the problem. Then write the equation.

Question 15.
Sally sees 15 birds. Then she sees 17 more. How many birds did Sally see in all?
___ + ___ = ___
Answer:

Topic 10 Assessment Practice

Question 1.
Write an equation that matches the place-value blocks below.
Envision Math Common Core 1st Grade Answers Topic 10 Use Models and Strategies to Add Tens and Ones 90.3
Answer:

Question 2.
Find the sum. Draw place-value blocks to show how you found it. 50 + 3 = ___
Answer:

Question 3.
Find the sum of 16 and 18.
Use words, pictures, or a model to solve. Write the equation.
Envision Math Common Core 1st Grade Answer Key Topic 10 Use Models and Strategies to Add Tens and Ones 90.33
Answer:

Question 4.
Which equation matches the place-value blocks shown below? Choose two that apply.
Envision Math Common Core 1st Grade Answer Key Topic 10 Use Models and Strategies to Add Tens and Ones 90.4
Answer:
Envision Math Common Core 1st Grade Answer Key Topic 10 Use Models and Strategies to Add Tens and Ones 90.5 60 + 30 = 90
Envision Math Common Core 1st Grade Answer Key Topic 10 Use Models and Strategies to Add Tens and Ones 90.5 6 tens + 3 tens = 9 tens
Envision Math Common Core 1st Grade Answer Key Topic 10 Use Models and Strategies to Add Tens and Ones 90.5 60 + 10 = 70
Envision Math Common Core 1st Grade Answer Key Topic 10 Use Models and Strategies to Add Tens and Ones 90.5 4 tens + 3 tens = 7 tens
Envision Math Common Core 1st Grade Answer Key Topic 10 Use Models and Strategies to Add Tens and Ones 90.5 6 tens + 3 ones = 9 ones
Answer:

Question 5.
Find the sum of 18 and 11. Explain how you solved the problem. Did you need to make a 10?
Answer:

Question 6.
Solve the problem.
Use place-value blocks if needed. 28 + 13 = Can you make a 10? Explain.
Circle Yes or No.
Envision Math Common Core 1st Grade Answer Key Topic 10 Use Models and Strategies to Add Tens and Ones 90.6

Question 7.
Use the part of the hundred chart to add. Choose the possible explanation for how to find 46 + 20.
Envision Math Common Core 1st Grade Answer Key Topic 10 Use Models and Strategies to Add Tens and Ones 90.7
A. I start at 46 and then move two rows up to get 26. So, 46 + 20 = 26.
B. I start at 46 and then move one row down and four columns to the right to get 60. So, 46 + 20 = 60.
C. I start at 46 and then move two rows down to get 66. So, 46 + 20 = 66.
D. I start at 46 and then move two rows down to get 68. So, 46 + 20 = 68.
Answer:

Use the part of the hundred chart to solve each problem. What is one way to explain your answer?
Envision Math Common Core 1st Grade Answer Key Topic 10 Use Models and Strategies to Add Tens and Ones 90.8

Question 8.
10 + 27 = ?
A. 17; I started at 27 and subtracted 1 ten.
B. 28; I started at 27 and added 1 ten.
C. 37; I started at 27 and added 1 ten.
D. 40; I started at 10 and added 3 tens.
Answer:

Question 9.
4 + 35 = ?
A. 95; I started at 35 and added 4 tens.
B. 39; I started at 35 and added 4 ones.
C. 31; I started at 35 and subtracted 4 ones.
D. 12; I started at 32 and subtracted 2 tens.

Use mental math to solve. Then explain how you found your answer.

Question 10.
53 + 10 = ___
Answer:

Question 11.
48 + 10 = ___
Answer:

Question 12.
64 + 10 = ___
Answer:

Find the correct number to complete each equation.

Question 13.
20 + 70 = ___
Answer:

Question 14.
30 + ___ = 60
Answer:

Question 15.
__ + 20 = 40
Answer:

Question 16.
Use the open number line to find 40 + 23. Show your work.
Envision Math Common Core 1st Grade Answer Key Topic 10 Use Models and Strategies to Add Tens and Ones 90.10
Answer:

Question 17.
Find 43 + 8. Do the models correctly show the sum? Explain how you know.
Envision Math Common Core 1st Grade Answer Key Topic 10 Use Models and Strategies to Add Tens and Ones 90.15
Answer:

Solve each problem. Can you make a 10? Use place-value blocks if needed.
Envision Math Common Core 1st Grade Answer Key Topic 10 Use Models and Strategies to Add Tens and Ones 90.16
Answer:

Pet Survey

Maria asked other students what kind of pet they have. She made this chart.
Envision Math Common Core 1st Grade Answer Key Topic 10 Use Models and Strategies to Add Tens and Ones 90.17

Question 1.
How many Fish and Cats in all? Use the open number line to solve.
Envision Math Common Core 1st Grade Answer Key Topic 10 Use Models and Strategies to Add Tens and Ones 90.18
___ fish and cats
Answer:

Question 2.
How many Dogs and Birds in all? Use the hundred chart to add.
Envision Math Common Core 1st Grade Answer Key Topic 10 Use Models and Strategies to Add Tens and Ones 90.20
__ + __ = ___
__ dogs and birds
Answer:

Question 3.
Maria asks 18 students about their pets on Monday. She asks 17 students about their pets on Tuesday. How many students did she ask on both days?
Use place-value blocks to solve. Draw the blocks you used.
Envision Math Common Core 1st Grade Answer Key Topic 10 Use Models and Strategies to Add Tens and Ones 90.200
Did you need to make a 10 when you added the ones? Explain your answer.
Answer:

Question 4.
Maria adds other pets to her chart. 19 students in first grade have a rabbit. 24 students in second grade have a rabbit. How many students in all have rabbits?
Part A
Draw blocks to help you solve the problem.
Part B
Write an equation that matches the story.
Envision Math Common Core 1st Grade Answer Key Topic 10 Use Models and Strategies to Add Tens and Ones 90.21
Answer:

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