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Lesson plan

Find the area of a rectangle by multiplying the lengths of two sides.

teaches Common Core State Standards MP8 http://corestandards.org/Math/Practice/MP8
teaches Common Core State Standards MP7 http://corestandards.org/Math/Practice/MP7
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 multiplying the lengths of two sides.

Big Ideas: Area is a measurement of how much surface is covered. The area of a rectangle can be found by multiplying the lengths of the sides. This lesson builds on counting individual squares and using repeated addition to find the area of a rectangle. Students will use the dimensions of a rectangle to determine the area. They should build understanding that the side lengths correspond to the number of unit squares in each row or column using language such as "4 rows of 8 squares is 4x8 or 32 square units". This builds toward greater efficiency in finding area and prepares students to compute the area of complex rectilinear figures. Vocabulary: repeated addition multiplication dimensions rows and columns array