## Go Math Grade 1 Chapter 4 Answer Key Subtraction Strategies

**Curious George**

Six little chicks are on the fence. Two chicks hop away. How many are there now?

**Show What You Know**

**Model Subtraction**

Use to show each number. Take away. Write how many are left.

Question 1.

Question 2.

**Use Symbols to Subtract**

Use the picture. Write the subtraction sentence.

Question 3.

Question 4.

**Subtract All or Zero**

Write how many are left.

Question 5.

Question 6.

### Subtraction Strategies Vocabulary Builder

**Visualize It**

Complete the chart.

Mark each row with a

**Understand Vocabulary**

Complete the sentences with review words.

Question 1.

3 is the ___ for 5 – 2 = 3.

Question 2.

7 – 4 = 3 is a __.

Question 3.

You __ to solve 5 – 1.

Question 4.

You can __ 2 from 6

### Subtraction Strategies Game: Under the Sea

**Materials**

Play with a partner. Take turns.

1. Put your on START.

2. Spin the Move that number of spaces.

3. Spin again. Subtract that number from the number on the game board space.

4. Use to check your answer. If you are not correct, lose a turn.

5. The first player to get to END wins.

### Subtraction Strategies Vocabulary Game

**Picture It**

**Materials**

timer

**How to Play**

Play with two other players.

1. Choose a secret word from the Word Box. Do not tell the other players.

2. Set the timer.

3. Draw pictures to show clues for the secret word.

4. The first player to guess the word before time runs out gets 1 point.

5. Take turns.

6. The first player to score 5 points wins.

**The Write Way**

**Reflect**

Choose one idea. Draw and write about it.

• Write sentences that use two of these math words.

**subtract difference count back subtraction sentence**

• MiWon needs to solve this problem:

11 – 7 = _____

Tell about two ways MiWon could solve it.

### Lesson 4.1 Count Back

**Essential Question**

How can you count back 1, 2, or 3?

**Listen and Draw**

Start at 9. Count back to find the difference.

**Math Talk**

**MATHEMATICAL PRACTICES**

Reasoning Why do you count backward to find the difference?

**Model and Draw**

You can count back to subtract.

**Share and Show MATH BOARD**

Use

Count back 1, 2, or 3 to subtract.

Write the difference.

Question 1.

5 – 1 = __

Question 2.

__ = 5 – 2

Question 3.

6 – 1 = __

Question 4.

__ = 6 – 3

Question 5.

7 – 2 = __

Question 6.

__ = 7 – 3

Question 7.

10 – 1 = _

Question 8.

__ = 10 – 2

Question 9.

12 – 3 = __

Question 10.

__ = 8 – 2

Question 9.

12 – 3 = __

Question 10.

__ = 8 – 2

Question 11.

4 – 3 = __

Question 12.

__ = 9 – 1

**On Your Own**

**MATHEMATICAL PRACTICE**

**Attend to Precision**

Count back 1, 2, or 3. Write the difference.

Question 13.

9 – 3 = __

Question 14.

__ = 5 – 3

Question 15.

6 – 3 = __

Question 16.

7 – 2 = __

Question 17.

__ = 10 – 1

Question 18.

8 – 1 = __

Question 19.

5 – 2 = __

Question 20.

__ = 8 – 3

Question 21.

11 – 3 = __

Question 22.

**THINK SMARTER**

Jaime has 6 carrots on her plate. She eats 2 carrots. How many carrots are on her plate now?

__ – __ = __ carrots

Question 23.

**GO DEEPER**

There are 12 flowers in Sasha’s garden. She picks 3 flowers for her father. Then she picks 2 flowers for her mother. How many flowers are in the garden now?

__ – __ = __

__ – __ = __ flowers

Question 24.

**THINK SMARTER**

Alex subtracts 3 from 10. What is a subtraction sentence he could write?

**Problem Solving • Applications**

Write a subtraction sentence to solve.

Question 25.

**GO DEEPER** Carlos has 11 train cars. He puts 2 train cars on the track. How many train cars are off the track?

__ – __ = __ train cars

Then Carlos puts 1 more train car on the track. How many train cars are off the track now?

__ – __ = __ erasers

Question 26.

Sofia has 8 erasers. She gives 2 to Ben. How many erasers does Sofia have now?

___ – __ = __ erasers

Question 27.

**THINK SMARTER**

Write the number that is 1 less.

9 – 1 =

**TAKE HOME ACTIVITY**

• Have your child show how to use the count back strategy to find the difference for 7 − 2. Repeat with other problems to count back 1, 2, or 3 from 12 or less.

### Count Back Homework & Practice 4.1

**Count back 1, 2, or 3. Write the difference.**

Question 1.

___ 7 – 3

Question 2.

8 – 3 = ___

Question 3.

4 – 3 = ___

Question 4.

__ = 9 – 1

Question 5.

__ = 7 – 1

Question 6.

__ = 6 – 2

Question 7.

6 – 1 = __

Question 8.

5 – 3 = ___

Question 9.

__ = 11 – 3

Question 10.

5 – 2 = __

Question 11.

10 – 2 = __

Question 12.

__ = 10 – 3

Question 13.

__ = 9 – 3

Question 14.

4 – 2 = __

Question 15.

__ = 7 – 2

**Problem Solving**

Write a subtraction sentence to solve.

Question 16.

Tina has 12 pencils. She gives away 3 pencils. How many pencils are left?

__ – ___ = __

__ pencils

Question 17.

**WRITE Math**

Use pictures or words to explain how you can solve 7 – 3 by counting back.

**Lesson Check**

Question 1.

Count back 3. What is the difference? Write the number.

__ = 10 – 3

Question 2.

Count back 2. What is the difference? Write the number.

7 – 2 = __

**Spiral Review**

Question 3.

Write a doubles fact to solve. Kai has 14 marbles. Some are blue and some are yellow. The number of blue marbles is the same as the number of yellow marbles.

__ = __ + __

Question 4.

Draw a picture to find the sum. Write the number sentence. There are 4 big dogs and 3 small dogs. How many dogs are there?

__ + __ = __

### Lesson 4.2 Think Addition to Subtract

**Essential Question**

How can you use an addition fact to find the answer to a subtraction fact?

**Listen and Draw**

Use to model the problem. Draw to show your work.

5 + __ = 12

12 – 5 = __

**Math Talk**

**MATHEMATICAL PRACTICES**

**Look for Structure** Explain how 5 + 7 = 12 can help you find 12 − 5.

**Model and Draw**

What is 9 − 4?

**Share and Show MATH BOARD**

Use to add and to subtract.

Question 1.

What is 8 − 6?

Question 2.

What is 8 − 4?

Question 3.

What is 10 − 4?

Question 4.

What is 12 − 6?

**On Your Own**

**MATHEMATICAL PRACTICE**

**Model Mathematics**

Use to add and to subtract.

Question 5.

Question 6.

Question 7.

Question 8.

**THINK SMARTER**

Carol can use an addition sentence to write a subtraction sentence. Write a subtraction sentence she can solve using 6 + 8 = 14.

Question 9.

Write an addition sentence Carol can use to help her solve 13 − 9.

**Problem Solving • Applications**

Write a number sentence to solve.

Question 10.

There are 14 cats. 7 are black. The rest are yellow. How many yellow cats are there?

___ yellow cats

Question 11.

I had some pencils. I gave 4 pencils away. Now I have 2 pencils. How many pencils did I start with?

__ pencils

Question 12.

**GO DEEPER**

Sarah has 8 fewer flowers than Ann. Ann has 16 flowers. How many flowers does Sarah have?

Question 13.

**THINK SMARTER**

Look at the facts.

Write the missing number in each fact

**TAKE HOME ACTIVITY**

• Write 5 + 4 = and ask your child to write the sum. Have him or her explain how to use 5 + 4 = 9 to solve __ – 4 = 5 and then write the answer.

### Think Addition to Subtract Homework & Practice 4.2

Use to add and to subtract.

Question 1.

Question 2.

Question 3.

**Problem Solving**

Question 4.

Write a number sentence to solve. I have 18 pieces of fruit. 9 are apples. The rest are oranges. How many are oranges

__ oranges

Question 5.

**WRITE Math**

Use pictures or words to explain how you can use 2 + __ = 7 to solve 7 – 2 = __

**Lesson Check**

Question 1.

Use the sum of 7 + 9 to solve 16 − 9.

7 + 9 = __ 16 – 9 = __

Question 2.

What is the missing number?

**Spiral Review**

Question 3.

Use to model the 3 addends. Write the sum.

4 + 4 + 6 = __

Question 4.

Draw a picture to show your work. Write the number. There are 5 birds. 3 birds fly away. How many birds are there now?

__ birds

### Lesson 4.3 Use Think Addition to Subtract

**Essential Question**

How can you use addition to help you find the answer to a subtraction fact?

**Listen and Draw**

Use . Draw to show your work. Write the number sentences.

**Model and Draw**

An addition fact can help you subtract.

What is 8 − 6?

**Share and Show MATH BOARD**

Think of an addition fact to help you subtract

Question 1.

What is 9 − 6?

Question 2.

What is 11 − 5?

Question 3.

What is 10 − 8?

Question 4.

What is 7 − 4?

**On Your Own**

**MATHEMATICAL PRACTICE
Analyze**

Think of an addition fact to help you subtract.

Question 5.

Question 6.

Question 7.

Question 8.

Question 9.

Question 10.

Question 11.

Question 12.

Question 13.

Question 14.

Question 15.

Question 16.

Question 17.

**THINK SMARTER**

Emil has 13 pencils in a cup. He takes some pencils out. There are 6 pencils left in the cup. How many pencils does he take out?

What addition fact can you use to solve this problem?

__ + __ = ___

So, Emil takes out __ pencils.

**TAKE HOME ACTIVITY**

• Ask your child to explain how the addition fact 8 + 6 = 14 can help him or her to find 14 − 6.

### Use Think Addition to Subtract Homework & Practice 4.3

Think of an addition fact to help you subtract.

Question 1.

Question 2.

Question 3.

Question 4.

Question 5.

Question 6.

Question 7.

**Problem Solving**

Question 8.

Solve. Draw or write to show your work. I have 15 stamps. Some are old. 6 are new. How many stamps are old?

__ stamps

Question 9.

**WRITE Math**

Use pictures or words to explain how you can use addition to solve 14 – 9.

**Lesson Check**

Question 1.

Use 9 + __ = 13 to find the difference.

Question 2.

Use 8 + __ = 11 to find the difference.

**Spiral Review**

Question 3.

Add. Write the doubles fact you used to solve the problem.

4 + 5 = __

Question 4.

Circle the greater addend. Count on to find the sum.

7 + 2 = __

### Subtraction Strategies Mid-Chapter Checkpoint

**Concepts and Skills**

Count back 1, 2, or 3 to subtract. Write the difference.

Question 1.

7 – 1 = __

Question 2.

__ = 7 – 2

Question 3.

12 – 3 = __

Question 4.

9 – 3 = __

Question 5.

6 – 2 = __

Question 6.

8 – 3 = __

Question 7.

__ = 11 – 3

Question 8.

5 – 2 = __

Use to add and to subtract.

Question 9.

Question 10.

Question 11.

**THINK SMARTER**

Write a subtraction sentence you can solve by using 3 + 9 = 12.

__ – __ = ___

### Lesson 4.4 Use 10 to Subtract

**Essential Question**

How can you make a ten to help you subtract?

**Listen and Draw**

Use to show the problem. Draw to show your work.

**Math Talk**

**MATHEMATICAL PRACTICES**

Represent How can your drawing help you solve 15 – 9?

**Model and Draw**

You can make a ten to help you subtract.

**Share and Show MATH BOARD**

Use and ten frames. Make a ten to subtract. Draw to show your work.

Question 1.

12 – 8 = __?__

12 – 8 = __

Question 2.

11 – 9 = __?__

11 – 9 = __

**On Your Own**

**MATHEMATICAL PRACTICE**

**Use a Concrete Model**

Use and ten frames. Make a ten to subtract. Draw to show your work.

Question 3.

14 – 9 = __?__

14 – 9 = __

Question 4.

11 – 8 = __?__

11 – 8 = __

Solve. Use the ten frames to make a ten to help you subtract.

Question 5.

There are 14 flowers in the garden. 9 are red. The rest are yellow. How many flowers are yellow?

— yellow flowers

**Problem Solving • Applications**

Solve. Use the ten frames to make a ten to help you subtract.

Question 6.

**GO DEEPER**

Mia has 18 beads. 9 are red and the rest are yellow. How many beads are yellow?

__ yellow beads

Question 7.

**THINK SMARTER**

John had some stickers. He gave 9 to April. Then he had 7. How many stickers did John start with?

__ stickers

Question 8.

**THINK SMARTER**

Which shows a way to make a ten to subtract?

17 – 8 = __?__

**TAKE HOME ACTIVITY**

• Ask your child to explain how he or she solved Exercise 6.

### Use 10 to Subtract Homework & Practice 4.4

Use and ten frames. Make a ten to subtract. Draw to show your work.

Question 1.

12 – 9 = __?__

12 – 9 = __

Question 2.

12 – 8 = __?__

12 – 8 = __

**Problem Solving**

Solve. Use the ten frames to make a ten to help you subtract.

Question 3.

Marta has 15 stickers. 8 are blue and the rest are red. How many stickers are red?

__ stickers

Question 4.

**WRITE Math**

Draw ten frames and counters to show how to solve 18 – 9 = __.

**Lesson Check**

Question 1.

Look at the model. Write the subtraction sentence that the model shows.

__ – __ = __

**Spiral Review**

Question 2.

What number sentence does this model show?

Question 3.

This ten frame shows 5 + 8. Draw to make ten. Then write the new fact.

### Lesson 4.5 Break Apart to Subtract

**Essential Question**

How do you break apart a number to subtract?

**Listen and Draw**

Use to solve each problem. Draw to show your work.

**Math Talk**

**MATHEMATICAL PRACTICES**

Reasoning How do you find how many markers Tom gave away? Explain.

**Model and Draw**

Think about ten to find 13 − 4.

Place 13 counters in two ten frames.

**Share and Show MATH BOARD**

Subtract.

Question 1.

What is 15 − 7?

**On Your Own**

**MATHEMATICAL PRACTICE**

**Reason Quantitatively**

Subtract.

Question 2.

**GO DEEPER**

What is 14 − 6?

Question 3.

What is 16 − 7?

**Problem Solving • Applications WRITE Math**

Use the ten frames.

Write a number sentence to solve.

Question 4.

**THINK SMARTER**

There are 14 sheep in the herd. 5 sheep run away. How many sheep are left in the herd?

Question 5.

**THINK SMARTER**

What subtraction sentence does the model show?

**TAKE HOME ACTIVITY**

• Ask your child to explain how he or she solved Exercise 4.

### Break Apart to Subtract Homework & Practice 4.5

Subtract.

Question 1.

What is 13 − 5?

**Problem Solving**

Question 2.

There are 17 goats in the barn. 8 goats go outside. How many goats are still in the barn?

Question 3.

**WRITE Math**

Draw ten frames and counters to show how you would break apart a number to find 14 – 6.

**Lesson Check**

Question 1.

Show how to make a ten to find 12 − 4. Write the number sentence.

__ – __ – __ = __

**Spiral Review**

Question 2.

Use Color and draw to show a way to take apart 7. Complete the subtraction sentence.

7 – __ = __

Question 3.

Use doubles minus one to solve 8 + 7. Write the number sentence.

### Lesson 4.6 Problem Solving • Use Subtraction Strategies

**Essential Question**

How can acting out a problem help you solve the problem?

Kyle had 13 hats. He gave 5 hats to Jake. How many hats does Kyle have now?

**Unlock the Problem**

What do I need to find?

Kyle has now

What information do I need to use?

**Show how to solve the problem.**

**HOME CONNECTION**

• Your child used counters to act out the subtraction story. The graphic organizer helps your child analyze the information given in the problem.

**Try Another Problem**

Act it out to solve. Draw to show your work.

Question 1.

Heather has 14 crackers. Some crackers are broken. 8 crackers are not broken. How many crackers are broken?

__ crackers are broken.

**Share and Show MATH BOARD**

**MATHEMATICAL PRACTICE**

**Analyze**

Act it out to solve. Draw to show your work.

Question 2.

Phil had some stickers. He lost 7 stickers. Now he has 9 stickers. How many stickers did Phil start with?

Phil started with __ stickers.

Question 3.

Hillary has 9 dolls. Abby has 18 dolls. How many fewer dolls does Hillary have than Abby?

Hillary has __ fewer dolls

Question 4.

Josh had 12 seeds. He planted some in the dirt. He has 5 left. How many seeds did he plant in the dirt?

Josh planted __ seeds.

Question 5.

Cami has 13 apples. Some are green and some are red. She has 8 red apples. How many apples are green?

__ apples are green.

**On Your Own WRITE Math**

Choose a way to solve. Draw or write to explain.

Question 6.

**THINK SMARTER**

10 frogs are in the tree. 3 more frogs jump into the tree. Then 4 frogs jump out of the tree. How many frogs are in the tree now?

Question 7.

There are 9 more turtles in the water than on a log. 13 turtles are in the water. How many turtles are on a log?

__ turtles

Question 8.

**GO DEEPER**

Choose a number to fill in the blank. Solve. 10 dogs are at the park.

__ dogs are brown. The rest have black spots. How many dogs have black spots?

__ dogs

Question 9.

**THINK SMARTER**

Chris has 10 worms. He gives away some of his worms. He has 6 worms left. How many worms did Chris give away?

Chris gave away worms.

**TAKE HOME ACTIVITY**

• Tell your child a subtraction story. Ask your child to use small objects to act out the problem to solve it.

### Problem Solving • Use Subtraction Strategies Homework & Practice 4.6

**Act it out to solve. Draw to show your work.**

Question 1.

There are 13 monkeys. 6 are small. The rest are big. How many monkeys are big?

13 – 6 =

__ monkeys are big.

Question 2.

Mindy had 13 flowers. She gave some to Sarah. She has 9 left. How many flowers did she give to Sarah?

13 – = 9

Mindy gave __ flowers to Sarah.

Question 3.

There are 5 more horses in the barn than outside. 12 horses are in the barn. How many horses are outside?

12 – 5 =

__ horses are outside.

Question 4.

**WRITE Math**

Use pictures or words to explain how you would act out the following problem. Joe has 9 toy cars. Dan has 6 toy cars. How many fewer toy cars does Dan have than Joe?

**Lesson Check**

Question 1.

Solve. Complete the number sentence. Jack has 14 oranges. He gives some away. He has 6 left. How many oranges did he give away?

14 – __ = 6

Jack gave away __ oranges.

Question 2.

Solve. Complete the number sentence. 13 pears are in a basket. Some are yellow and some are green. 5 pears are green. How many pears are yellow?

13 − 5 = __

__ pears are yellow.

**Spiral Review**

Question 3.

Draw a picture to solve. Rita has 4 plants. She gets 9 more plants. Then Rita gets 1 more plant. How many plants does she have now?

__ plants.

Question 4.

What is the sum of 10 + 5?

__

### Subtraction Strategies Chapter 4 Review/Test

Question 1.

Count back. Write the number that is 2 less.

Question 2.

Look at the facts. A number is missing. Which number is missing?

Question 3.

Write a subtraction sentence you can solve by using 5 + 4 = 9

Question 4.

**THINK SMARTER**

Make a ten to subtract. Draw to show your work. Write the difference.

Question 5.

What subtraction sentence does the model show?

Question 6.

Lupe has 9 books. She gives some away. She has 7 left. How many books does she give away? Draw or write to explain.

Lupe gives away books.

Question 7.

Look at the number sentences. What number is missing? Write the number in each box.

Question 8.

means “count back 1.”

means “count back 2.”

means “count back 3.”

Match each picture to a number sentence.

Question 9.

Make a 10 to subtract.

Question 10.

How does the model show 15 − 6? Choose the numbers that make the number sentences true. Circle numbers in the boxes.

Question 11.

**GO DEEPER**

Mark has 11 He gives some away. He has 4 left. How many does he give away? Draw a picture to help you subtract.

How is drawing like acting out a problem?