1. Chapter 6 Section 8 Pre-Algebra Percent of Change

2. Tells the % an amount has increased or decreased in relation to the original amount

3. How can % help to describe a change in area? Change in Area Original Area Draw each rectangle Then compare Express Increase as a fraction and % a. X: 2 units by 3 units y: 2 units by 4 units b. G: 2 units by 5 units H: 2 units by 6 units c. J: 2 units by 4 units K: 2 units by 5 units

4. Find % of Change % of change = amt of change/orig. measurement Find % of change from 56 inches to 63 inches. Step 1: Subtract to find the amount of change 63 – 56 = 7 Step 2: Use formula 7/56 = 0.125 or 12.5%

5. Find Percent of Change Find the percent of change from $32 to $44. 44 - 32 = 12 12/32 = 0.375 Write the decimal as a percent. The amount of change from $32 to $44 is 37.5%.

6. Find % Increase In 1975, the average price per gallon of gasoline was $0.57. In 2000, the average price per gallon was $1.47. Find the % Change 1.47 – 0.57 0.9 0.9/0.57 1.58 158%

7. Find Percent of Increase In Cleveland, Ohio, the high temperature on one day was 43° F, and the next day was 71°. Find the percent of change. 71 – 43 28 28/43 0.65 65%

8. Quiz http://www.glencoe.com/sec/math/studytools/cgi- bin/msgQuiz.php4?isbn=0-07-860368- 4&chapter=6&lesson=8&&headerFile=5&state=nc http://www.glencoe.com/sec/math/studytools/cgi- bin/msgQuiz.php4?isbn=0-07-860368- 4&chapter=6&lesson=8&&headerFile=5&state=nc