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Lesson Plan

Solve problems involving multiplication and division by using area models with missing side lengths

teaches Common Core State Standards CCSS.Math.Content.3.MD.C.7b
teaches Common Core State Standards CCSS.Math.Content.3.OA.A.4
teaches Common Core State Standards CCSS.Math.Practice.MP2
teaches Common Core State Standards CCSS.Math.Practice.MP6
teaches Common Core State Standards CCSS.Math.Practice.MP8

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Big Idea: Area can be decomposed and added together. Multiplication can be used to find the area of a rectangle. Division can be used as an inverse operation to find a missing side length of a rectangle. This lesson builds on students' work using different representations to multiply and divide. In this task, students must determine the dimensions of a new solar pool cover by using various multiplication and division operations. Students determine lengths, widths, and area measurements, drawing and labeling these dimensions on a diagram of the pool cover. The mathematical concepts in this lesson build toward students' work using multiplication to find the area of composite rectangles. Vocabulary: area, decompose, side length, width
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