Lesson plan

Find the area of a rectangular figure by using repeated addition with the number in each row or in each column

teaches Common Core State Standards CCSS.Math.Content.3.MD.C.5b http://corestandards.org/Math/Content/3/MD/C/5/b
teaches Common Core State Standards CCSS.Math.Content.3.MD.C.6 http://corestandards.org/Math/Content/3/MD/C/6
teaches Common Core State Standards CCSS.Math.Content.3.MD.C.7 http://corestandards.org/Math/Content/3/MD/C/7
teaches Common Core State Standards CCSS.Math.Practice.MP2 http://corestandards.org/Math/Practice/MP2
teaches Common Core State Standards CCSS.Math.Practice.MP7 http://corestandards.org/Math/Practice/MP7

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Big Ideas: Area is a measurement of how much surface is covered. The area of a rectangle can be found by repeated addition of the rows or columns. This lesson builds on counting unit squares to find area. Students will use repeated addition to find the area of rectangle while reasoning about arrays (rows and columns) of square units. They should develop language used to describe arrays (e.g., 8 rows of 4 squares). This builds toward using multiplication to find the area of a rectangle and reasoning about when using multiplication is appropriate. Vocabulary: area square units (unit squares) rows columns dimensions repeated addition skip counting Special Materials: square tiles (optional for modeling) grid paper (optional for modeling)