✓ Got It?

5. Reasoning If the gift box's dimensions in Problem 5 were measured to the nearest half inch, how would the greatest possible error be affected?

Practice and Problem-Solving Exercises

A Practice

See Problems 1 and 2.

Tell whether each percent change is an increase or decrease. Then find the percent change. Round to the nearest percent.

7. original amount: 12

   new amount: 18

8. original amount: 9

   new amount: 6

9. original amount: 15

   new amount: 14

10. original amount: 7.5

    new amount: 9.5

11. original amount: 40.2

    new amount: 38.6

12. original amount: 2008

    new amount: 1975

13. original amount: 14,500

    new amount: 22,320

14. original amount: 195.50

    new amount: 215.25

15. original amount: 1325.60

    new amount: 1685.60

16. Employment An employee was hired at a wage of $8 per hour. After a raise, the employee earned $8.75 per hour. What was the percent increase?
17. Climate On June 1, 2007, there were about 18.75 h of daylight in Anchorage, Alaska. On November 1, 2007, there were about 8.5 h of daylight. What was the percent decrease?

See Problem 3.

Find the percent error in each estimation. Round to the nearest percent.

18. You estimate that your friend's little brother is about 8 years old. He is actually 6.5 years old.
19. You estimate that your school is about 45 ft tall. Your school is actually 52 ft tall.

Table of Contents