Reteach - Lancaster School District...Name Copyright © The M cGraw-Hill Comp anies, Inc. Perm ission is granted to repr oduce for c lassr oom use. Lesson 4 Reteach Make a 10 You can

Grade 2

Reteach

Chapter 1

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Lesson 1 Reteach

Addition Properties

2 + 3 = 5

4 + 0 = 4

3 + 2 = 5 0 + 4 = 4

The order of the addends Add 0 to a number. The sumchanged. The sum is the same. is the same as the other addend.

Find each sum.

1. 8 + 4 =

12

4 + 8 = 12

3. 3 + 4 =

4 + 3 =

5. 5 + 3 =

3 + 5 =

2. 5 + 0 =

0 + 5 =

4. 1 + 8 =

8 + 1 =

6. 6 + 5 =

5 + 6 =

Grade 2 • Chapter 1 Apply Addition and Subtraction Concepts 3

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Lesson 2 Reteach

Count On to Add

You can use squares to count on.

Find 5 + 3. Start at 5. Count on 3.

1 2 3 4 5 6 7 8 5 + 3 = 8 5

+ 3

8

Use the squares. Add squares to count on.

1. 8 + 1 = 9

2. 6 + 2 =

3. 7 + 3 =

4. 5 + 1 =

5. 9 + 3 =

6. 7 + 2 =

7. 6 + 3 = 4 Grade 2 • Chapter 1 Apply Addition and Subtraction Concepts

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Lesson 3 Reteach

Doubles and Near Doubles

Addends that are the same are called doubles.

Two addends that are almost doubles are near

doubles.

3 + 3 = 6

Add. Use doubles.

3 + 4 = 7

1. 4 + 4 = 8

2. 6 + 5 =

3. 2 + 3 =

4. 5 + 5 =

addend addend


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Lesson 4 Reteach

Make a 10

You can make a 10 to find 8 + 3:

1. Add to 8 to make 10.

2. Subtract the same number from 3.

3. Add the sum and difference.

4. The answer is also the sum of 8 + 3.

We know that 10 + 1 equals 11, so 8 + 3 also equals 11. 10 + 1 = 11 and 8 + 3 = 11

Make a 10 to add. Use the example above for help.

8 + 3 = ?

10 + 1 = 11

8 + 2 = 10 3 - 2 = 1

1.

9 + 5 = ?

+ =

9 + = 10 5 - =

So, 9 + 5 = .

2.

7 + 6 = ?

+ =

7 + = 10 6 - =

So, 7 + 6 = .

6 Grade 2 • Chapter 1 Apply Addition and Subtraction Concepts

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Lesson 5 Reteach

Add Three Numbers

You can group addends. Find a double. Make a 10.

4 6

3 8 5 10

+ 4 + 3 + 4 + 5

11 15

You can use doubles or

make a 10.

Find a double. Circle addends that make

doubles. Add.

1. 3 4 4 3 5 3 6 2 4 5 8 7

+

6 5 10

+ 7 + 7 + 2 + 4 + 4 + 5 + 3 7 + 2 + 2

13

Make a 10. Circle addends that make a 10. Add.

2. 8 2 10 + 4 + 4

14

Find the sum.

3. 8 8 9 2 8 3 3 9 8 9 18 7 7 0 0 + 8 16 + 1 10 + 2 + 2 + 8 10 + 8 16

+ + + +

4 3 10 + 6 + 3

1 9 10+ 4 + 4

8 7 8+ 3 + 10

5 6 10+ 5 + 6


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Lesson 6 Reteach (1)

Problem Solving STRATEGY: Write a Number Sentence

Sanders’ Orchard sells bags of

apples. Malia buys 4 bags. Steve

buys 2 bags. How many bags of

apples do they buy in all?

What do I know?

Malia buys 4 bags. Steve buys 2 bags.

What do I need to find?

The total number of bags of apples Steve and Malia buy?

Understand

Step 1

Plan

Step 2

Solve

Step 3 Write a number sentence.

4 + 2 = 6

bags of apples

How will I solve?

I will write a number sentence.

Is my answer reasonable?

Step 4

Check


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Lesson 6 Reteach (2)

Problem Solving STRATEGY: Write a Number Sentence

Write a number sentence to solve.

1. A.J., Seth, and Lily each have 1 box of pencils. There are 5 pencils in each box. How many pencils do they have in all? pencils

+ + =

2. Johnny buys 3 bottles of juice for a party. He decides to buy 6 more bottles. How many total bottles does Johnny buy? bottles

+ =

3. Steffan has 3 sunflowers and 5 tulips in his garden. How many flowers are there in all? flowers

+ =

4. Mateo saw 3 red tricycles and 3 blue tricycles coming down the sidewalk. How many tricycles did he see in all? tricycles

+ =

stickers

5. Aiden has 7 robot stickers and 5 alien stickers on his folder. How many stickers in all?

+ =


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Lesson 7 Reteach

Count Back to Subtract

Count back to subtract.

8 - 2 =

6

Count back to subtract.

10 - 1 =

9

1.

7 - 4 =

3

Count back to subtract. Show how you use

to help.

2.

9 - 3 =

6

3.

9 - 2 =

7

4.

5 - 1 =

5.

6 - 2 =

6.

9 - 1 =

7.

8 - 6 =

8.

4 - 3 =

9.

7 - 3 =


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Lesson 8 Reteach

Subtract All and Subtract Zero

5 - 0 =

5 5 - 5 =

0

Subtract 0. Subtract all.You have the same number left. You have 0 left.

Subtract. You can cross out pictures to help.

1. 2.

9 - 0 =

9 6 - 0 =

9 - 9 =

0 6 - 6 =

3. 4.

4 - 0 = 7 - 0 =

4 - 4 = 7 - 7 =

5. 6.

8 - 0 =

5 - 0 =

8 - 8 =

5 - 5 =


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Lesson 9 Reteach

Use Doubles to Subtract

You can use doubles facts to subtract.

Remember, doubles are addends that are the same number.

If you know 6 + 6 = 12, you know 12 - 6 = 6 .

Subtract. Use doubles facts to help.

1.

4 + 4 = 8 , so

8 - 4 = .

2.

7 + 7 = , so

14 - 7 = .

3.

3 + 3 = , so

6 - 3 = .

4.

5 + 5 = , so

10 - 5 = .

5. 8 + 8 = , so

16 - 8 = .

6. 9 + 9 = , so

18 - 9 = .12 Grade 2 • Chapter 1 Apply Addition and Subtraction Concepts

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Lesson 10 Reteach

Relate Addition and Subtraction

8 + 4 = 12 These addition and subtraction facts have the same three numbers.

12 - 4 = 8

Use addition facts to subtract.

1. 2.

4 + 7 = 11 3 + 6 =

11 - 7 = 4 9 - 3 =

3. 4.

9 + 3 = 2 + 5 =

12 - 3 = 7 - 5 =

5. 6 .

2 + 8 = 1 + 6 =

10 - 2 = 7 - 6 =


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Lesson 11 Reteach

Missing Addends

9 + = 14 Write a related fact.

Related facts use the 14 - 9 = 5same numbers. So, 9 + 5 = 14.

Find the missing addend. Draw pictures to help.

1. 8 + 4 = 12

12 - 8 = 4

2. 7 + = 12

12 - 7 =

3. 5 + = 13

13 - 5 =

4. 9 + = 17

17 - 9 = 14 Grade 2 • Chapter 1 Apply Addition and Subtraction Concepts

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Lesson 12 Reteach

Fact Families

Some fact families have two addition facts and two subtraction facts.

9 + 7 = 16 16 - 7 = 9

7 + 9 = 16 16 - 9 = 7

Some fact families have one addition fact and one subtraction fact.

8 + 8 = 16 16 - 8 = 8

Complete each fact family.

1. 9 + 4 = 13 13 - 9 = 4

4 + 9 = 13 13 - 4 = 9

2. 6 + 5 = 11 - 5 =

5 + 6 = 11 - 6 =

3. 9 + 8 = 17 - 9 =

8 + 9 = 17 - 8 =

4. 7 + 7 = 14 - 7 =


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Lesson 13 Reteach

Two-Step World Problems

You can draw a model to help solve two-step

word problems.

Mia had 3 friends over for a party. 2 more friends came. Then 3 more friends came late. How many friends are over now?

Step 1 Step 2

3 friends were over

2 more came

3 + 2 = 5 friends

5 friends are over

3 more friends came late

5 + 3 = 8 friends

On a separate sheet of paper, draw a model to

help solve. Then, write the number sentences.

1. Ella found 2 pens in her room. She found 4 more pens in the kitchen. Ella then found 2 more pens in her brother’s room. How many pens did Ella find in all?

Step 1: + = Step 2: + = pens

2. Ryan saw 8 birds in a tree. 2 flew away. Ryan went outside, and 3 more birds flew away. How many birds are left?

Step 1: - = Step 2: - = pens


Reteach - Lancaster School District...Name Copyright © The M cGraw-Hill Comp anies, Inc. Perm ission is granted to repr oduce for c lassr oom use. Lesson 4 Reteach Make a 10 You can

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