Answer Key
CHAPTER 2 Addition of Whole Numbers
Lesson 2
Activity (page 105)
3 + 4 = 7 7 + 2 = 9
4 + 3 = 7 2 + 7 = 9
On The Road to Learning (pages 104 and 105)
A. 1. 9 3. 6
2. 11 4. 10
B. 1. 12 4. 9
2. 3 5. 16
3. 1 6. 18
C. 1. 8 3. 12
2. 0 4. 0
On The Road to Learning (pages 106 and 107)
A.
1. 9 + 3 = 12; 3 + 9 = 12
2. 2 + 6 = 8; 6 + 2 = 8
3. 8 + 6 = 14; 6 + 8 = 14
B.
1. done; done
2. 5 + 6; 6 + 5
3. 9 + 7; 7 + 9
C.
1. 8
2. 6
3. 8
On The Road to Learning (page 109)
A.
1. done
2. 5 + 3 + 6 = 14
(5 + 3) + 6 = 5 + (3 + 6)
8 + 6 = 5 + 9
14 = 14
3. 4 + 6 + 8 = 18
(4 + 6) + 8 = 4 + (6 + 8)
10 + 8 = 4 + 14
18 = 18
4. 7 + 4 + 6 = 17
(7 + 4) + 6 = 7 + (4 + 6)
11 + 6 = 7 + 10
17 = 17
B.
1. done
2. (8 + 4) + 2 or 8 + (4 + 2) ; 14
3. (9 + 0) + 6 or 9 + (0 + 6) ; 15
4. (7 + 5) + 5 or 7 + (5 + 5) ; 17
5. (6 + 3) + 5 or 6 + (3 + 5) ; 14
Creating My Math Word Corner (page 111)
Sample answers: zero property, order property, grouping property
Showing What I Have Learned
Hitting the Mark (pages 111 and 112)
A.
1. addends
2. 0 or zero
3. groupings
B.
1. 8 + 3 = 11
2. 2 + 5 = 7
C.
1. 2 + 4 + 6 = 12 3. 2 + 1 + 7 = 10
2. 3 + 4 + 2 = 9 4. 5 + 6 + 3 = 14
D.
1. possible answers: 2 + 6 + 8 = 16, etc.
2. possible answers: 3 + 5 + 7 = 15, etc.
3. possible answers: 4 + 3 + 6 = 13, etc.
4. possible answers: 9 + 9 = 18, 8 + 10 = 18, etc.
E.
1. 16 3. 15
2. 18 4. 18
Going Beyond the Mark (pages 112 and 113)
1.
CHAPTER 2 Addition of Whole Numbers
Lesson 2
Activity (page 105)
3 + 4 = 7 7 + 2 = 9
4 + 3 = 7 2 + 7 = 9
On The Road to Learning (pages 104 and 105)
A. 1. 9 3. 6
2. 11 4. 10
B. 1. 12 4. 9
2. 3 5. 16
3. 1 6. 18
C. 1. 8 3. 12
2. 0 4. 0
On The Road to Learning (pages 106 and 107)
A.
1. 9 + 3 = 12; 3 + 9 = 12
2. 2 + 6 = 8; 6 + 2 = 8
3. 8 + 6 = 14; 6 + 8 = 14
B.
1. done; done
2. 5 + 6; 6 + 5
3. 9 + 7; 7 + 9
C.
1. 8
2. 6
3. 8
On The Road to Learning (page 109)
A.
1. done
2. 5 + 3 + 6 = 14
(5 + 3) + 6 = 5 + (3 + 6)
8 + 6 = 5 + 9
14 = 14
3. 4 + 6 + 8 = 18
(4 + 6) + 8 = 4 + (6 + 8)
10 + 8 = 4 + 14
18 = 18
4. 7 + 4 + 6 = 17
(7 + 4) + 6 = 7 + (4 + 6)
11 + 6 = 7 + 10
17 = 17
B.
1. done
2. (8 + 4) + 2 or 8 + (4 + 2) ; 14
3. (9 + 0) + 6 or 9 + (0 + 6) ; 15
4. (7 + 5) + 5 or 7 + (5 + 5) ; 17
5. (6 + 3) + 5 or 6 + (3 + 5) ; 14
Creating My Math Word Corner (page 111)
Sample answers: zero property, order property, grouping property
Showing What I Have Learned
Hitting the Mark (pages 111 and 112)
A.
1. addends
2. 0 or zero
3. groupings
B.
1. 8 + 3 = 11
2. 2 + 5 = 7
C.
1. 2 + 4 + 6 = 12 3. 2 + 1 + 7 = 10
2. 3 + 4 + 2 = 9 4. 5 + 6 + 3 = 14
D.
1. possible answers: 2 + 6 + 8 = 16, etc.
2. possible answers: 3 + 5 + 7 = 15, etc.
3. possible answers: 4 + 3 + 6 = 13, etc.
4. possible answers: 9 + 9 = 18, 8 + 10 = 18, etc.
E.
1. 16 3. 15
2. 18 4. 18
Going Beyond the Mark (pages 112 and 113)
1.
2. a. possible answer: 5 + 0 = 5 , 3 + 0 = 3 , etc.
b. possible answer: 5 + 3 = 3 + 5 , etc.
c. possible answer: (5 + 3) + 6 = 5 + (3 + 6), etc.
Understanding How I Learned (page 113)
Answers may vary. Sample answers:
1. If I need help in math, I want assistance in using grouping property of addition.
2. During a math activity, I enjoyed using zero property of addition.
3. I helped my classmates in using order property of addition.
b. possible answer: 5 + 3 = 3 + 5 , etc.
c. possible answer: (5 + 3) + 6 = 5 + (3 + 6), etc.
Understanding How I Learned (page 113)
Answers may vary. Sample answers:
1. If I need help in math, I want assistance in using grouping property of addition.
2. During a math activity, I enjoyed using zero property of addition.
3. I helped my classmates in using order property of addition.