Lesson Plan

Solve problems involving area of a rectangle by using tiling 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 Idea: 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. All of these concepts will come together in this lesson when students are asked to find the area of different sections of a rectangle and then put those sections together to find the area of the entire rectangle. This lesson will support students’ ability to find the area of more difficult shapes in future lessons. Vocabulary: area, square units, tiling, distributive property
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