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Lesson Plan

Solve a percent problem by using the constant of proportionality

teaches Common Core State Standards CCSS.Math.Content.7.EE.B.3
teaches Common Core State Standards CCSS.Math.Content.7.RP.A.3
teaches Common Core State Standards CCSS.Math.Practice.MP1
teaches Common Core State Standards CCSS.Math.Practice.MP2

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Big Ideas: A sales tax increases the cost of an item by the constant of proportionality. A percent is another way to write a decimal or fraction that compares part to a whole where the whole is 100. This task provides students with the opportunity to use their knowledge of percent to work backwards in solving a multi-step problem. The solution to the task can be obtained through multiple strategies which will deepen students' understanding of proportionality. The task also facilitates a deeper understanding of calculating with percents. For example, multiplying by 1.065 will efficiently provide a buyer with the cost of an item including a 6.5% tax. Vocabulary: constant of proportionality, percent, tax Special Materials: Calculator as needed
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