NAME ___________________________________________________ DATE _____________________ PERIOD __________
Lesson 4 Homework Practice
Percent of Change
Find the percent of change. Round to the nearest tenth, if necessary. Then state whether
the percent of change is an increase or decrease.
1. from 4 m to 5 m
2. from 75 minutes to 100 minutes
25%; increase
33.3%; increase
3. from $9.25 to $6.50
4. from 45 quarts to 8 quarts
-29.7%; decrease
-82.2%; decrease
5. from 21 mm to 13 mm
6. from $457 to $1000
-38.1%; decrease
118.8%; increase
7. from $39.50 to $40.00
8. from 9 students to 856 students
1.3%; increase
9411.1%; increase
9. from 24 kittens to 7 kittens
10. from 15 songs to 105 songs
-70.8%; decrease
600%; increase
Find the percent error.
11. projected time: 30 seconds, actual time: 27 seconds 11.1%
53.8%
25%
13. actual height: 2 meters, estimated height: 1.5 meters
14. measured perimeter: 22 feet, actual perimeter: 24 feet
15. actual number: 220, calculated number: 218
8.3%
0.9%
16. projected duration: 4 minutes, actual duration: 3.5 minutes
14.3%
17. estimated mass: 250 grams, actual mass: 231 grams
8.2%
18. projected time: 45 minutes, actual time: 80 minutes
43.8%
19. On Tuesday, a baker sold 132 cookies. On Wednesday, she sold 108 cookies. Find the percent
of change to the nearest tenth of a percent. about -18.2%; decrease
20. Savannah estimates that her dog weighs 30 pounds. When she takes her dog to the vet for
his check-up, the dog is placed on the scale and actually weighs 32.5 pounds. What was
Savannah’s percent of error of her estimate? Round to the nearest percent. 8%
Math Accelerated • Chapter 6 Percents
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12. estimated cost: $1.00, actual cost: $0.65