Lesson plan

Solve problems involving area of a rectangle by using area models to represent the distributive property

teaches Common Core State Standards CCSS.Math.Content.3.MD.C.7c http://corestandards.org/Math/Content/3/MD/C/7/c
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: Understand that the area of a rectangle can be broken apart into smaller regions that are easier to solve and add together to determine the area of the original rectangle. Students have already learned how to partition a rectangle into rows and columns and use tiling as well as multiplying side lengths to find area of a rectangle. Students have also practiced breaking numbers apart into more familiar facts (distributive property) to make those numbers easier to work with in a problem. In this lesson students use all of this knowledge to use area models to represent the distributive property when solving for the area of a rectangle. This lesson will support students’ ability to find the area of more difficult shapes in future lessons. Vocabulary: area, square units, distributive property