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Lesson plan

Find the area of a rectangle by counting the number of square units needed to cover it and show this is the same as calculating the area by multiplying the length by the width

teaches Common Core State Standards 3.MD.C.7.a http://corestandards.org/Math/Content/3/MD/C/7/a

Find the area of a rectangle by counting the number of square units needed to cover it and show this is the same as calculating the area by multiplying the length by the width