This is a second grade Math Unit, Lesson 9 out of 15. Reasoning with Shapes and their Attributes - Making Rectangles. 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. Aligned to Common Core State Standards: 2.G.2 , MP.4 , MP.7
Reasoning with Shapes & their Attributes Lesson 9
Partition a rectangle into rows and columns of same-size squares and count to find the total number of them.