In this interactive from APT, explore proportional reasoning with percent of change. Proportions are applied to real-world problems to demonstrate how changes in prices or amounts affect the percent of increase or decrease. In the accompanying classroom activity, students work together as a class and then in small groups to calculate price changes and the percent of change that these changes represent for grocery items, houses, and stock prices. They conclude the activity by thinking of other real-world examples that require calculating percent.

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