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Lesson Plan

Solve for the area of a composite figure by subtracting

teaches Common Core State Standards CCSS.Math.Practice.MP1 http://corestandards.org/Math/Practice/MP1
teaches Common Core State Standards CCSS.Math.Content.6.G.A.1 http://corestandards.org/Math/Content/6/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
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Big Ideas: The area of a composite figure can be solved for by subtracting. This lesson builds on students’ work with decomposing polygons into triangles, rectangles, and other shapes. In this task, students will discover that the area of a composite figure can be found by subtracting the shape or part of the shape from a larger figure. By subtracting area(s), students will continue to build on their understanding of the concept that area is additive. The mathematical concepts in this lesson build toward students’ future work with finding the areas of 2-D composite figures, surface area, and the slicing of 3-D figures in grades 6-8. Vocabulary: area, additive, decompose Special Materials: Grid Paper Supplementary Handout
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