This past week’s puzzle: This past weekend, as Max was learning to stack cups quickly, he and I discussed triangle numbers. One way to describe the set of triangle numbers is the set of numbers that ...

This investigation is an effective way of introducing triangular numbers for those in KS3 and gets students to explore the sequence of triangular numbers through shapes and their properties. Pupils ...

A triangular number counts objects arranged in an equilateral triangle. I think this is pretty much all you’ll ever need on the topic of Triangular Numbers - with 11 self-contained worksheets! It uses ...