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