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 Interactive Checkpoint
 Triangular Number:  The numbers 1, 3, 6, 10, ... are called triangular numbers because the number of dots representing the number can be arranged into a triangle.

Answer the following question about triangular numbers.

 Enter each answer below and press tab to check

Graded Response
What are the two terms that follow 1, 3, and 6 in the triangular number sequence?   and