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The number of dots in an individual polygonal shape represents a particular figurate number for each pattern. For example, the first five triangular numbers are 1, 3, 6, 10, 15. The first four square ...

We were able to do a number talk with my favorite Math Might, DC, and then we talked about triangles, squares, and rectangles. Overall I think you did a fantastic job. I want you to kiss your brains.

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