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Lesson Plan

9. Multiply to find the area of rectangles in word problems (FP)

teaches Common Core State Standards CCSS.Math.Content.3.MD.C.5b
teaches Common Core State Standards CCSS.Math.Content.3.MD.C.6
teaches Common Core State Standards CCSS.Math.Content.3.MD.C.7a
teaches Common Core State Standards CCSS.Math.Practice.MP1
teaches Common Core State Standards CCSS.Math.Practice.MP2
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Lesson objective: Multiply side lengths to solve word problems involving the area of a rectangle.

This lesson helps to build procedural skill with using multiplication to solve word problems involving the area of a rectangle. Partitioning a rectangle into equal square units is used here because it supports student understanding of the connection between area of a rectangle, arrays, and the structure of multiplication. This work develops students' understanding that we can find the area of a rectangle (with whole number length sides) by tiling it with unit squares or by multiplying the side lengths.

Students engage in Mathematical Practice 2 (reason abstractly and quantitatively) as they use drawings and equations to represent real world area situations. Students also engage in Mathematical Practice 6 (attend to precision) as they use the correct square units to give meaning to their answers.

Key vocabulary:

  • area
  • length
  • partition
  • repeated addition equation
  • row
  • skip count
  • square centimeter
  • square foot
  • square inch
  • square meter
  • square unit
  • width

Special materials needed:

  • centimeter graph paper
  • square tiles
Related content

Appears in

Developing conceptual understanding of area

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