Lesson plan

Recognize area as additive by decomposing rectilinear figures into non-overlapping rectangles when solving for area

teaches Common Core State Standards CCSS.Math.Content.3.MD.C.7d http://corestandards.org/Math/Content/3/MD/C/7/d
teaches Common Core State Standards CCSS.Math.Content.3.OA.B.5 http://corestandards.org/Math/Content/3/OA/B/5

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Big Ideas: Complex shapes can be decomposed into non-overlapping rectangles in order to find the area of the entire figure. Opposite sides of rectangles have equal measurements. Students have learned many strategies to find the area of simple shapes, such as rectangles, and complex, rectilinear figures. In this lesson students will choose any of these strategies to find the area of complex, rectilinear figures. This will support students’ ability to find the area of more difficult shapes in future lessons. Vocabulary: complex shape, decompose, rectilinear figure Special Materials: none