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