Percent Of Change

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Chapter 6 Section 7 Percent Of Change

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Percent Of Change

  1. 1. Chapter 6, Section 7: Percent of Change <ul><li>Warm Up: Write each decimal as a percent. </li></ul><ul><li>0.46 </li></ul><ul><li>2.47 </li></ul><ul><li>0.03 </li></ul><ul><li>5.236 </li></ul><ul><li>46% </li></ul><ul><li>247% </li></ul><ul><li>3% </li></ul><ul><li>523.6% </li></ul>
  2. 2. Finding Percent of Increase <ul><li>The percent an amount increases or decreases from its original amount is the percent of change . </li></ul><ul><li>So Percent of Change = </li></ul>amount of change original amount
  3. 3. Find the percent of increase from 4 to 7.5 <ul><li>1 st : amount of increase: 7.5 – 4 = 3.5 </li></ul><ul><li>2 nd : set up fraction. </li></ul><ul><li>Percent of increase = </li></ul>amount of change original amount Divide to find the decimal. Move decimal 2 places to the right Percent increase from 4 to 7.5 is 87.5% 7.5 – 4 4 = 3.5 4 = 0.875 = 87.5%
  4. 4. Try These: Find each percent of increase. <ul><li>From 100 to 114 </li></ul><ul><li>From 2.0 to 3.2 </li></ul><ul><li>From 4,000 to 8,500 </li></ul>14% 60% 112.5%
  5. 5. Word Problem <ul><li>The annual production of video games in the United States has more than doubled since the 1960s. Find the percent of increase from 1960 to 1990. </li></ul>Percent of increase from 1960-1990 was about 133%. 205,000 1990 88,000 1960 Number of Video Games Produced Year
  6. 6. Finding Percent of Decrease <ul><li>Percent of Decrease is found the SAME way that Percent of Increase is. </li></ul><ul><li>1 st : Find Percent of Decrease. </li></ul><ul><li>Subtract both numbers being compared. </li></ul><ul><li>2 nd : Amount of Decrease </li></ul><ul><li>Original Amount </li></ul><ul><li>3 rd : Divide and move decimal 2 places to the right. </li></ul>
  7. 7. Find each percent of decrease. Round to nearest tenth. <ul><li>From 9.6 to 4.8 </li></ul><ul><li>From 202 to 192 </li></ul><ul><li>From 854.5 to 60.6 </li></ul>50% 5% 92.9%
  8. 8. Word Problem <ul><li>A computer that costs $875 last year costs $745 this year. Find the percent of decrease to the nearest percent. </li></ul>14.85%
  9. 9. Assignment #23 <ul><li>Page 318: 6-36 all. </li></ul><ul><li>www.phschool.com </li></ul><ul><li>Code: awe-0607 </li></ul>

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