Answer Key
CHAPTER 3 Subtraction of Whole Numbers
Lesson 2
On The Road to Learning (page 176)
1. 16 , 8 4. 18 , 9 7. 4 , 2
2. 6 , 3 5. 10 , 5 8. 8 , 4
3. 14, 7 6. 2 , 1
On The Road to Learning (page 177)
1. 9 5. 9 9. 7
2. 2 6. 8 10. 6
3. 12 7. 9
4. 8 8. 10
Creating My Math Word Corner (page 178)
Sample answers: taking away, subtraction using doubles, subtraction using number line
Showing What I Have Learned
Hitting the Mark (page 179)
1. 8 3. 7 5. 7 and 12
2. 9 4. 8
Going Beyond the Mark (page 180)
1. Ramon needs to take away 5 coins.
2. Roger needs 6 more marbles.
3. 7 – 2 or 7 – 5
Understanding How I Learned (page 180)
Answers may vary. Sample answers:
1. The part of the lesson I found difficult to do was subtraction using number line.
2. I now know better how to subtract one-digit numbers through 18.
3. I can improve in subtraction using number line through 18.
CHAPTER 3 Subtraction of Whole Numbers
Lesson 2
On The Road to Learning (page 176)
1. 16 , 8 4. 18 , 9 7. 4 , 2
2. 6 , 3 5. 10 , 5 8. 8 , 4
3. 14, 7 6. 2 , 1
On The Road to Learning (page 177)
1. 9 5. 9 9. 7
2. 2 6. 8 10. 6
3. 12 7. 9
4. 8 8. 10
Creating My Math Word Corner (page 178)
Sample answers: taking away, subtraction using doubles, subtraction using number line
Showing What I Have Learned
Hitting the Mark (page 179)
1. 8 3. 7 5. 7 and 12
2. 9 4. 8
Going Beyond the Mark (page 180)
1. Ramon needs to take away 5 coins.
2. Roger needs 6 more marbles.
3. 7 – 2 or 7 – 5
Understanding How I Learned (page 180)
Answers may vary. Sample answers:
1. The part of the lesson I found difficult to do was subtraction using number line.
2. I now know better how to subtract one-digit numbers through 18.
3. I can improve in subtraction using number line through 18.