Practice Test

1. (B) 42
2. (C) 12
3. (D) 2x9 plus 2x9
4. (A) Multiply 7 by 8 and then subtract 30.
5. (A) 7, 14, 21, 28, 35
6. (B) 18
7. (C) 5
8. (B) 28
9. 8
10. 36
11. Use 2x8=16 and add it to 6x8=48
12. 35 shells
13. 32 granola bars
14. 15 combinations
15. No. All numbers that are multiples of 4 must be even numbers, so 29 is not a multiple of 4. 
16. Sample Answers: (1x6)+6x6); (2x6)+(5x6); (3x6)+(4x6)
17. 6 miles; I multiplied 2 x 3 miles = 6 miles
18. Sample Answers: (1x8) and (3x8); (2x8) and (2x8)

Reteaching 6-9

1. $15; $5
2. $26
3. Find the cost of the T-shirts: 3 x $8 = $24. Then, subtract the total from $50: $50-$24=$26.

Practice 6-9

1. $12, $8
2. $26
3. $14
4. $17
5. Problems will vary.
6. (B) $24

Reteaching 6-8

1. 9 combinations
2. 8 combinations
3. Sample Answer: Draw 3 rows with 4 combinations in each row or 3x4=12 combinations

Practice 6-8

1. 9 combinations
2. 15 combinations
3. 21 combinations
   
4. 7 combinations
   
5. (C) 12
   
6. The number of different flavors of jelly he has. 
   

Reteaching 6-7

1. 14; 2, 4, 6, 8, 10, 12, 14
2. 40; 5, 10, 15, 20, 25, 30, 35, 40
3. 48; Sample Answer: 3x8=24 and 3x8=24
4. 45; Sample Answer: 5x5=25 and 4x5=20
5. 42; Sample Answer: 4x6=24 and 3x6=18
6. Sample Answer: 3x9=27, 3x9=27, 27+27=54; I chose 3x9 because 6x9 is 6 groups of 9. So I can use 3 groups of 9 twice. 
   

Practice 6-7

1. 16
2. 20
3. 36
4. 49
5. 72
6. 12
7. 3
8. 35
9. 32
10. 54
11. 20
12. 0
13. 81
14. 36
15. 80
16. 18 crew members; 6x3=18
17. 12 crew members; 6x2=12
18. (D) 63
19. Rick counted by 5 too many times. He should have counted by 5 just two times: 5, 10.  Or he could have counted by 2s:2, 4, 6, 8, 10.

Reteaching 6-6

1. 6
2. 30
3. 18
4. 42
5. 56
6. 60
7. 24
8. 70
9. 36; Possible number sentence: 6x2x3 = (6x2)x3 = 36  or   6x(2x3)=36
10. Group 4x2x2 as 4x(2x2)=4x4=16

Practice 6-6

1. 18
2. 16
3. 32
4. 36
5. 36
6. 50
7. 40
8. 24
9. 48
10. 80
11. 16 marbles
12. 60 stamps
13. Yes. Possible Answers: 6x2x4=6x(2x4)=6x8=48; 48<50
14. (A) 2
15. (3x2)x4=6x4=24; 3x(2x4)=3x8=24; 3x2x4=(3x4)x2=12x2=24

Reteaching

1. 16
2. 32
3. 40
4. 56
5. 64
6. 0
7. 42
8. 72
9. 8
10. 48
11. 40 pints
12. Find 7x4=28 and add 28+28=56. So, 7x8=56

Practice

1. 8
2. 0
3. 24
4. 16
5. 56
6. 24
7. 32
8. 72
9. 40
10. 64
11. 80
12. 56
13. 42
14. 24
15. 72
16. 24 arms
17. Find the product of 4x7=28 and then add the product to itself. So, 28+28=56
18. They both are. Since 8 is a multiple of 2 and a multiple of 4, all of the multiples of 8 are also multiples of 2 and 4.
19. 40 boxes
20. 56
21. (B) 48

6-3 was Wednesday's classwork
Reteaching 6-3

1. 24
2. 32
3. 20
4. 36
5. 4
6. 12
7. 28
8. 24
9. 0
10. 16
11. Answers will vary. Possible answer: Multiply 2x8=16 and add 16 to itself to get 32.

Practice 6-3

1. 8
2. 20
3. 12
4. 16
5. 40
6. 24
7. 4
8. 12
9. 0
10. 28
11. 40
12. 4
13. 8
14. 36
15. 32
16. 2x7
17. 32 people
18. 36 tickets
19. 40 practices
20. The commutative property of multiplication states that the order of the factors does not change the product, so 5x4=20.
21. (C) 20

6-4 is Thrusday's homework
Reteaching 6-4

1. 14
2. 42
3. 63
4. 24
5. 48
6. 49
7. 12
8. 56
9. 21
10. 36
11. 30
12. 28
13. 54
14. 21
15. 42
16. Sample Answer: No, 5x4 and 1x4 is 5 groups of 4 plus 1 group of 4. That is 6 groups of 4, not 6 groups of 8.

Practice 6-4

1. 30
2. 18
3. 48
4. 21
5. 70
6. 28
7. 24
8. 35
9. 56
10. 36
11. 42
12. 60
13. 70
14. 49
15. 12
16. 7x9
17. 21 days
18. 42 slices
19. 48 people
20. Sample Answer: Add the product 1x6 to 30. 30+6=36, so 6x6=36
21. (D) 28 minutes

Reteaching

1. 6
2. 12
3. 15
4. 3
5. 27
6. 54
7. 21
8. 0
9. 40
10. 9
11. Multiply 2x8=16 and add the factor 8. 16+8=24. So, 3x8=24

Practice

1. 3
2. 21
3. 18
4. 24
5. 50
6. 6
7. 12
8. 0
9. 14
10. 9
11. 15
12. 30
13. 6
14. 27
15. 27
16. 18 wheels
17. 15 tickets
18. 4+4+4=12 or 3+3+3+3=12
19. 12
20. Both are correct. The commutative property of multiplication states the order of the factors does not change the product. 
21. (C) 24

Reteaching 6-1
1. Sample Answers: (3x3) and (1x3), or (2x3) and (2x3)
2. Sample Answers: (2x6) and (3x6), or (1x6) and (4x6)
3. The fact is 2x7. The number sentence is 4x7=(2x7)+(2x7).

Practice 6-1
1. Sample Answers: (5x6) and (3x6)  /  (4x6) and (4x6)  /  (6x6) and (2x6)
2. Sample Answers: (3x9) and (1x9)  /  (2x9) and (2x9)
3. 8x3 = (2x3) + (6x3)
4. 7x7 = (3x7) and (4+7)
5. Array should show 6x9. 6x9 = (2x9) + (4x9)
6. (D) 5