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Lesson Plan

Show that the order of the factors does not change the product by multiplying side lengths to find the area of a rectangle

teaches Common Core State Standards CCSS.Math.Content.3.MD.C.7a http://corestandards.org/Math/Content/3/MD/C/7/a
teaches Common Core State Standards CCSS.Math.Practice.MP7 http://corestandards.org/Math/Practice/MP7
teaches Common Core State Standards CCSS.Math.Practice.MP8 http://corestandards.org/Math/Practice/MP8
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 order of the factors does not change the product. The area of a rectangle can be found by multiplying side lengths. Counting unit squares of a rectangle is the same as multiplying side lengths. This lesson builds on multiplying side lengths to find the area of a rectangle. Students will discover the commutative property in this task by using an area model to understand that the order of the factors does not change the product. This builds toward understanding properties of operations and applying strategies to find the area of complex rectilinear figures. Vocabulary: commutative property (not required) factors product area model square units Special Materials: grid paper (optional)
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