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# 8 4 Percent Of Change

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### 8 4 Percent Of Change

1. 1. 8-4 Percent of Change Find the percent of increase or decrease
2. 2. Work with a partner <ul><li>Begin with 2 paper strips. On each strip, label 0% on the left side and 100% on the right side. </li></ul><ul><li>Fold one of the paper strips in half. Mark 50% in the center. </li></ul><ul><li>Cut this strip at the 50% mark and place it beside the end of the purple strip. The new longer strip represents a 50% increase or 105% </li></ul>0% 100% 0% 100% 0% 100% 0% 50% 0% 50% 100%
3. 3. Model each percent of change <ul><li>25% increase </li></ul><ul><li>75% increase </li></ul><ul><li>30% increase </li></ul><ul><li>Describe a model that represents a 100% increase, a 200% increase, and a 300% increase. </li></ul><ul><li>Describe how this process would change to show percent of decrease. </li></ul>
4. 4. What is percent of Change?
5. 5. T-table Percent of Decrease Percent of Increase
6. 6. Find each percent of change. Round to the nearest whole percent if necessary. Put it under the correct side of the t-table. <ul><li>original: 10 new : 13 </li></ul><ul><li>original: 20 new: 15 </li></ul>
7. 7. Word problems worksheet <ul><li>Do not write on the handout </li></ul>
8. 8. # sort <ul><li>Sort problems into percent of increase or decrease. </li></ul><ul><li>You do not have to solve them. </li></ul>
9. 9. Homework <ul><li>P 352: 1-3, 12-22 even, 25-27, 29, 32, 33, 35 (16 problems) </li></ul><ul><li>QUIZ 8.2-8.4 tomorrow </li></ul>