NAME DATE PERIOD Lesson 5 Homework Practice
NAME _____________________________________________ DATE __________________ PERIOD _________
Lesson 5 Homework Practice
Percent of Change
For Exercises 1?14, find each percent of change. Round to the nearest whole percent if necessary. State whether the percent of change is an increase or decrease.
1. 8 feet to 10 feet
25% increase
2. 136 days to 85 days
38% decrease
3. $0.32 to $0.37
16% increase
4. 62 trees to 31 trees
50% decrease
5. 51 meters to 68 meters 6. 16.5 grams to 24.8 grams
33% increase
50% increase
7. 0.55 minute to 0.1 minute
82% decrease
8. $180 to $210
17% increase
9. 2.9 months to 4.9 months
69% increase
10. 0.5 to 0.75
50% increase
11. 0.1 to 0.2
100% increase
12. 1.5 to 0.375
75% decrease
13. SURGERY Recent developments in surgical procedures change the average
healing time for some operations from 8 weeks to 3 weeks. 62.5% decrease
14. ROADS The city added an extra lane in each direction to the 5-lane
road. 40% increase
15. GEOMETRY Refer to the rectangle shown. Suppose the width of 4 inches is decreased by 3 inches.
a. Find the percent of change in the perimeter. 30% decrease
b. Find the percent of change in the area. 75% decrease
4 in. 6 in.
16. ANALYZE TABLES Refer to the table that shows the average monthly rainfall during the first six months of the year for Singapore.
a. Between which two consecutive months is the percent of decrease the greatest? What is the percent change to the nearest whole percent?
January to February; 31% decrease
b. Between which two consecutive months is the percent of increase the least? What is the percent change to the nearest whole percent?
April to May; 2%
Month
January February March April May June
Average Rainfall (inches/month)
9.4 6.5 6.8 6.6 6.7 6.4
Copyright ? The McGraw-Hill Companies, Inc. Permission is granted to reproduce for classroom use.
Course 2 ? Chapter 2 Percents
31
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