Unit 1, Lesson 9# Making Rectangles

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When students create rectangles using same-size squares in this lesson, they are transitioning from composing two-dimensional shapes to form composite shapes (which they learned to do in 1st grade) and laying a foundation for partitioning rectangles into same-size squares. This lesson asks students to look for and make use of structure by paying attention to the rows and columns of squares that form their rectangles. The students will also model with mathematics by noticing how two different arrangements of squares represent two different ways of counting, even though both arrangements have the same total number of squares. Find the area of various sized rectangles, identifying the number of rows and columns in each along with the total area.