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 http://corestandards.org/Math/Content/3/MD/C/7/b
teaches Common Core State Standards CCSS.Math.Content.3.OA.A.4 http://corestandards.org/Math/Content/3/OA/A/4
teaches Common Core State Standards CCSS.Math.Practice.MP2 http://corestandards.org/Math/Practice/MP2
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 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