To Start: 10 Points!!! 66 is what percent of 122? 66=x122 54% What is 32% of 91? x=.3291 x=29.1.

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Presentation transcript:

To Start: 10 Points!!! 66 is what percent of 122? 66=x*122 54% What is 32% of 91? x=.32*91 x=29.1

Chapter 6: Ratios, proportions, and percents Section 6-8: Percent of Change

Percent of Change!!! The percent a quantity increases or decreases from its original amount is the percent of change.

Percent of Increase!!! Find the percent of increase from 4 to 7.5. Amount of increase = 7.5 – 4 = 3.5 Original amount = 4 The percent of increase from 4 to 7.5 is 87.5%

Percent of Increase – You Try!!! Find the percent of increase from 100 to 114. Amount of increase = 114 – 100 = 14 Original amount = 100 The percent of increase from 100 to 114 is 14%

Percent of Decrease!!! Find the percent of decrease from 1,500 to 1,416. Amount of decrease = 1500 – 1416 = 84 Original amount = 1500 The percent of decrease from 1,500 to 1,416 is 5.6%

Percent of Decrease – You Try!!! Find the percent of decrease from 9.6 to 4.8. Amount of decrease = 9.6 – 4.8 = 4.8 Original amount = 9.6 The percent of decrease from 9.6 to 4.8 is 50%

Percent of Decrease – You Try!!! Find the percent of decrease from 202 to 192. Amount of decrease = 202 – 192 = 10 Original amount = 202 The percent of decrease from 202 to 192 is 5%

Homework!!!! Page 316: 1-6, 8-16, 20-29 Pre-Algebra I’m so glad I’m not in Science class!!! Pre-Algebra