**Answer Key**

CHAPTER 3 Subtraction of Whole Numbers

Lesson 1

**On The Road to Learning**(pages 164 and 165)

A.

1. 7 3. 8 5. 7

2. 5 4. 2 6. 1

B. 1. 10 – 4 = 6 2. 9 – 6 = 3

C. Check also the number of items crossed out.

1. 6 (3 balloons)

2. 6 (4 stars)

**On The Road to Learning**(page 166)

A.

1. 3 3. 2 5. 7

2. 4 4. 1 6. 5

B. 1. 5 2. 3

**On The Road to Learning**(page 168)

A.

1. 10 , 9 4. 10 , 5

2. 9 , 4 5. 9 , 5

3. 7 , 3

B.

*Answers may vary. Possible answers:*

1. 7 + 3 = 10

10 – 3 = 7

2. 5 + 4 = 9

9 – 4 = 5

3. 6 + 2 = 8

8 – 2 = 6

**On The Road to Learning**(pages 169 and 170)

A.

1. 3 + 7 = 10 10 – 3 = 7

7 + 3 = 10 10 – 7 = 3

2. 6 + 2 = 8 8 – 2 = 6

2 + 6 = 8 8 – 6 = 2

3. 4 + 6 = 10 10 – 4 = 6

6 + 4 = 10 10 – 6 = 4

B.

1. 9 + 2 = 11 11 – 2 = 9

2 + 9 = 11 11 – 9 = 2

2. 8 + 4 = 12 12 – 4 = 8

4 + 8 = 12 12 – 8 = 4

**Creating My Math Word Corner**(page 171)

Sample answers: subtraction, minuend, subtrahend, difference, minus, related facts, opposite operations

**Showing What I Have Learned**

**Hitting the Mark**(pages 171 and 172)

A.

1. 2 5. 2 9. 4

2. 7 6. 4 10. 2

3. 10 7. 6 11. 3

4. 1 8. 0 12. 4

B.

**Going Beyond the Mark**(page 172)

1. 4 players are still running.

2. There are 6 bags left.

3. Answer may vary. Possible answer:

Josh has 8 pencils. He gave his two pencils to his younger brother. How many pencils were left? 8 – 2 = 6

**Understanding How I Learned**(page 173)

*Answers may vary. Sample answers:*

1. The part of the lesson I found interesting was the relationship of addition and subtraction as opposite operations.

2. I now know better how to do subtraction of numbers.

3. The new things I learned are the parts of a subtraction sentence and how to do subtraction of numbers.