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## What do you notice?

I want you to think about the following even/odd numbers, patterns, multiples, factors, multiplication, common multiples, prime/composite numbers.

# Triangular Numbers

- Students in each group should work to
*build triangles*of*different*sizes. - After building a triangle the group writes down the
*number of counters*that make up each triangle. Each of these numbers is a**Triangular Number**. - As each group builds triangles they should fill in the missing blanks on their worksheet with the correct number of dots for the given triangle.
- Groups will fill out the worksheet as they build triangles.