Download Choose a Method

Name
Lesson 2.6
Choose a Method
Find the product. Choose mental math, paper and pencil, or a calculator.
1.
820
⫻
10
_
2. 5,129
3.
⫻ 18
__
6. 500 ⫻ 12
7. 375 ⫻ 218
10. 400 ⫻ 320
11. 785 ⫻ 122
452
⫻
726
__
4.
304
⫻
21
_
8. 40 ⫻ 5,000
12. 93 ⫻ 11 ⫻ 34
5. 1,200
⫻ 12
__
9. 112 ⫻ 83
13. 40 ⫻ 10 ⫻ 200
Problem Solving and Test Prep
USE DATA For 14–15, use the table.
14. How many hours does a tiger sleep in
one year?
Animal Sleep
15. In one year, how many more hours
does a pig sleep more than a cow
sleeps?
Animal
Time (hours per day)
Tiger
16
Pig
9
Cow
4
17. A typical giraffe may weigh about 145
16. A typical African elephant may weigh
about 185 pounds at birth. At maturity
its weight is 32 times as great. What
does a typical African elephant weigh at
maturity?
A 1,075 pounds
A 3,710 pounds
B
1,305 pounds
B
4,920 pounds
C
2,380 pounds
C
5,920 pounds
D 2,610 pounds
pounds at birth. At maturity its weight is
18 times as great. What does a typical
giraffe weigh at maturity?
D 6,910 pounds
PW13
Practice
© Harcourt • Grade 5
MXENL08AWK5X_PHTE_C02_L06.indd PW13
6/15/07 12:22:11 PM
Name
Lesson 2.6
Choose a Method
820
⫻ 10
_
2. 5,129
8,200
⫻ 18
__
452
⫻ 726
__
92,322
328,152
6. 500 ⫻ 12
3.
7. 375 ⫻ 218
6,000
10. 400 ⫻ 320
4.
304
⫻ 21
_
81,750
1. 2
624
⫻ 12
__
14,400
2. 6
534
300; 400
3. 7
2,429
80; 90
4. 8
3,008
300; 400
300; 400
9. 112 ⫻ 83
9,296
200,000
12. 93 ⫻ 11 ⫻ 34
13. 40 ⫻ 10 ⫻ 200
34,782
80,000
95,770
Possible estimates are given.
Estimate the quotient.
5. 1,200
6,384
8. 40 ⫻ 5,000
11. 785 ⫻ 122
128,000
Lesson 3.1
Estimate with 1-Digit Divisors
Find the product. Choose mental math, paper and pencil, or a calculator.
1.
Name
5. 1,734 ⫼ 6
6. 224 ⫼ 7
7. 328 ⫼ 4
30; 40
200; 300
8. 2,331 ⫼ 9
80; 90
200; 300
Problem Solving and Test Prep
USE DATA For 14–15, use the table.
9. 2,892 ⫼ 6
14. How many hours does a tiger sleep in
10. 4,168 ⫼ 8
11. 541 ⫼ 7
12. 263 ⫼ 5
one year?
5,840 hours
400; 500
Animal Sleep
15. In one year, how many more hours
does a pig sleep more than a cow
sleeps?
Animal
Time (hours per day)
Tiger
16
Pig
9
Cow
4
13. A shipment of motorcycles weighs
17. A typical giraffe may weigh about 145
about 185 pounds at birth. At maturity
its weight is 32 times as great. What
does a typical African elephant weigh at
maturity? C
A 1,075 pounds
A 3,710 pounds
B
1,305 pounds
B
4,920 pounds
C
2,380 pounds
C
5,920 pounds
D 2,610 pounds
pounds at birth. At maturity its weight is
18 times as great. What does a typical
giraffe weigh at maturity? D
14. Another shipment of motorcycles weighs
2,776 pounds. The shipment included
8 identical motorcycles. About how
much did each motorcycle weigh?
2,079 pounds. This shipment included
7 mountain bikes. About how much did
each mountain bike weigh?
between 200 and 300
pounds
between 300 and 400
pounds
drove the same number of miles each
day, what is the best estimate of how far
B
Mr. Jones drove on the first day?
traveled the same number of miles each
day, what is the best estimate of how far
C
John drove on the first day?
A 162 mi
C
115 mi
A 190 mi
C
300 mi
140 mi
D
96 mi
B
268 mi
D
250 mi
B
Circled problems are suggested homework problems.
Circled problems are suggested homework problems.
Practice
PW14
© Harcourt • Grade 5
MXENL08AWK5X_PHTE_C02_L06.indd PW13
6/15/07 12:22:11 PM
Practice
© Harcourt • Grade 5
MXENL09AWK5X_PH_C03_L1.indd PW14
Lesson 2.6
Item
50; 60
15. Mr Jones drove 571 miles in 4 days. If he 16. John traveled 885 miles in 3 days. If he
D 6,910 pounds
PW13
70; 80
Problem Solving and Test Prep
1,825 more hours
16. A typical African elephant may weigh
500; 600
7/2/07 2:20:28 PM
Lesson 3.1
Suggested rationale
Item
Suggested rationale
1
mental math
1
estimate 3-digit quotient by
rounding
2
calculator
2
estimate 2-digit quotient by
rounding
4
paper and pencil
5
5
mental math
estimate 3-digit quotient
using rounding or compatible
numbers
13
3-factor mental math
6
estimate 2-digit quotient with
3-digit dividend using
rounding or compatible
numbers
14
problem solving
8
estimate 3-digit quotient
using rounding or compatible
numbers
10
estimate 3-digit quotient with
4-digit dividend using
rounding or compatible
numbers
13
problem Solving
15
multiple choice
15
problem solving
16
multiple choice
17
multiple choice
PW13-PW14
Practice
© Harcourt • Grade 5
MXENL08AWK5X_PHTE_RatA.indd PW13
7/2/07 3:00:19 PM