Name
Lesson 7.5
Estimate Products
Estimate the product.
1.
6.
34
2.1
__
7.1
7.1
__
11. 352.4 0.46
2.
0.3
0.8
__
3.
0.7
0.9
__
4.
4.4
0.6
__
5.
7.
26.3
5.4
__
8.
1.78
3.2
__
9.
44.7
2.5
__
10.
12. 0.129 22.3
13. 7.035 61
5.5
6.2
__
$9.06
0.63
__
14. $8.99 12
Problem Solving and Test Prep
15. FAST FACT The fastest marine mammal, 16. Brittany earns $6.25 an hour working at
the killer whale, can swim 35 miles per
hour. How many miles can the whale
swim in 10.25 hours?
17. A Ross seal at the aquarium weighs
the concession stand. How much does
she earn in 7.5 hours?
18. A bottlenose dolphin eats an average
430.92 pounds. A leopard seal weighs
2.3 times as much. Which expression
gives the closest estimate for the weight
of the leopard seal?
A 3 431
C
2 431
2 430
D
3 430
B
PW46
of 155.75 pounds of fish per week.
How much does the dolphin eat in
4.5 weeks?
Practice
© Harcourt • Grade 5
Name
Lesson 7.4
Name
Lesson 7.5
Model Multiplication by a Decimal
Estimate Products
Use the model to find the product.
Estimate the product.
1.
1.
3.
2.
34
2.1
__
2.
0.35
0.5 0.7 0.18
0.7 0.7 0.49
5. 0.8 0.2 0.16
6. 1.3 0.9 1.17
8. 0.6 0.6 0.36
9. 1.7 0.4 0.68
0.3 0.6 0.3
0.8
__
0.7
0.9
__
3.
0.3
60
6.
Possible estimates are given.
7.1
7.1
__
7.
4.4
0.6
__
0.7
26.3
5.4
__
1.78
3.2
__
8.
150
49
4.
5.
36
2.4
9.
44.7
2.5
__
10.
$9.06
0.63
__
$9.00
120
6
5.5
6.2
__
Make a model to find the product.
4. 0.1 0.4 0.04
7. 0.7 0.3 0.21
11. 352.4 0.46
200
Find the value of n.
10. 0.6 0.7 n
11. 0.5 n 0.45
n ⴝ 0.42
14. 0.4 n 0.12
12. 0.129 22.3
12. n 1.2 0.24
n ⴝ 0.9
15. 0.9 0.3 n
n ⴝ 0.3
13. 0.3 n 0.39
n ⴝ 0.2
n ⴝ 1.3
16. 1.3 0.5 n
17. n 0.5 0.55
n ⴝ 0.27
n ⴝ 0.65
13. 7.035 61
2
15. FAST FACT The fastest marine mammal, 16. Brittany earns $6.25 an hour working at
the killer whale, can swim 35 miles per
hour. How many miles can the whale
swim in 10.25 hours?
0.32
19. 0.3 0.3 0.09
20. 0.9 0.6 21. 1.4 0.5 0.7
22. 1.8 0.2 0.36
23. 1.1 0.1 0.54
0.11
$46.88
PW45
18. A bottlenose dolphin eats an average
430.92 pounds. A leopard seal weighs
2.3 times as much. Which expression
gives the closest estimate for the weight
of the leopard seal?
C
A 3 431
C
2 431
2 430
D
3 430
B
Circled problems are suggested homework problems.
the concession stand. How much does
she earn in 7.5 hours?
358.75 miles
17. A Ross seal at the aquarium weighs
18. 0.8 0.4 $90
420
Problem Solving and Test Prep
n ⴝ 1.1
Find the product.
14. $8.99 12
of 155.75 pounds of fish per week.
How much does the dolphin eat in
4.5 weeks?
700.875 pounds
Circled problems are suggested homework problems.
PW46
Practice
Practice
© Harcourt • Grade 5
© Harcourt • Grade 5
Lesson 7.4
Item
Lesson 7.5
Suggested rationale
Item
Suggested rationale
2
use model to multiply
decimals
1
estimate products of
decimals
3
use model to multiply
decimals
3
estimate products of
decimals
6
model decimal multiplication
4
estimate products of
decimals
11
solve decimal equation
8
estimate products of
decimals
12
solve decimal equation
10
estimate products of
decimals
13
solve decimal equation
16
eroblem solving
20
multiply decimals
17
test prep
21
multiply decimals
23
multiply decimals
PW45-PW46
Practice
© Harcourt • Grade 5
MXENL08AWK5X_PHTE_RatA.indd PW45
7/2/07 3:01:24 PM