Lesson plan

Compute the area of a rectangle by using scale factor

teaches Common Core State Standards CCSS.Math.Content.7.G.A.1 http://corestandards.org/Math/Content/7/G/A/1
teaches Common Core State Standards CCSS.Math.Practice.MP4 http://corestandards.org/Math/Practice/MP4
teaches Common Core State Standards CCSS.Math.Practice.MP6 http://corestandards.org/Math/Practice/MP6
teaches Common Core State Standards CCSS.Math.Practice.MP8 http://corestandards.org/Math/Practice/MP8

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Big Ideas: The area of a scale drawing can be calculated using proportional reasoning and a scale factor. This lesson builds on students’ previous work using proportional reasoning to find new dimensions and includes previous learning for finding area of a geometric figure. The task requires students to find the dimensions and area for a rectangular dance space in the cafeteria by using a scale factor. Students develop understanding that the real area of the dance floor cannot be computed by multiplying the area of the scale drawing by the scale factor since the dance floor has two dimensions. Vocabulary: scale drawing, scale factor, dimensions, length, area Special Materials: graph paper colored pencils or markers