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Lesson Plan

Demonstrate understanding of the distributive property by using area models when solving for area of a rectangle

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: 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 or multiplication of 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 demonstrate their understanding of the distributive property when solving for area of a rectangle. This is just one strategy of many that students could use to solve for area of a rectangle and will support students’ ability to find the area of more difficult shapes in future lessons. Vocabulary: area, square units, tiling, area models, distributive property
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