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Lesson Plan

Find the area of a figure by decomposing it and applying the formula for area

teaches Common Core State Standards CCSS.Math.Content.4.MD.A.3
teaches Common Core State Standards CCSS.Math.Content.4.OA.A.3
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Big Ideas: We can apply the formula for area of rectangles to complex rectilinear shapes. In this lesson, students apply their understanding of the formula for area to complex rectilinear shapes. They decompose the shapes into smaller rectangles, then use the area formula to calculate the total area of the shape. This lesson is also intended to deepen the students' conceptual understanding of decomposing shapes and numbers, which will be beneficial when they begin working with area models for multi-digit multiplication. Vocabulary: area, square unit, decompose, formula Special Materials: grid paper
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