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Learn how to calculate and compare discounts in this video from KQED. In the accompanying classroom activity, students develop different strategies for calculating and comparing discounts, including percent off a price, percent of a price, and dollars off a price. They compare their strategies with those demonstrated in the video. Then, they write and solve story problems involving comparing percent off and dollars off a price. To get the most out of the lesson, students should be familiar with percent as a rate per 100 and comfortable calculating percent of a dollar amount (e.g., 80% of $80, 1% of $130).