Percent of Change

1. 65 255 42 52 Percent of Change PRE-ALGEBRA LESSON 6-8 Write these fractions to the nearest tenth of a percent. a.b. 25.5% 80.8% 6-8

2. Percent of Change PRE-ALGEBRA LESSON 6-8 Vocabulary The __________________ is the percent a quantity Increases or decreases from its original amount 6-8

3. amount of increase original amount percent of increase = = 1.6 8 Percent of Change PRE-ALGEBRA LESSON 6-8 Find the percent of increase from 8 to 9.6. amount of increase = 9.6 – 8 = 1.6 = 0.2 = 20% The percent of increase from 8 to 9.6 is 20%. Quick Check 6-8

4. amount of increase original amount percent of increase = = 15 7.5 Percent of Change PRE-ALGEBRA LESSON 6-8 In a given year, Hillsboro had a total of 7.5 in. of rain by March 1 and a total of 22.5 in. by July 1. Find the percent of increase from 7.5 to 22.5. amount of increase = 22.5 – 7.5 = 15 = 2 = 200% The percent of increase from March 1 to July 1 was 200%. Quick Check 6-8

5. 130 1,250 amount of decrease original amount percent of decrease = = Percent of Change PRE-ALGEBRA LESSON 6-8 Find the percent of decrease from 1,250 to 1,120. amount of decrease = 1,250 – 1,120 = 130 = 0.104 = 10.4% Quick Check 6-8

6. Percent of Change PRE-ALGEBRA LESSON 6-8 Solve. 1. Find the percent of increase from 22 to 63. 2. Find the percent of decrease from 6.3 to 2.2. 3. A surgeon performed 62 operations in 1991. He performed 342 in 2001. Find the percent of increase. 186.4% 65.1% 451.6% 6-8