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

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

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

4. 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. Percent of Change PRE-ALGEBRA LESSON 6-8 amount of increase = 22.5 – 7.5 = 15 = 2 = 200% The percent of increase from March 1 to July 1 was 200%. percent of increase = amount of increase original amount = 15 7.5 Quick Check 6-8

5. Find the percent of decrease from 1,250 to 1,120. Percent of Change PRE-ALGEBRA LESSON 6-8 amount of decrease = 1,250 – 1,120 = 130 = 0.104 = 10.4% percent of decrease = amount of decrease original amount = 130 1,250 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% 451.6% 65.1% 6-8