This maths activity uses triangular numbers to calculate the number of gifts in the 12 days of Christmas. In this festive maths activity, students will learn about triangular numbers and how, when a ...

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 ...

Introduction Do you ever use math as a tool to solve interesting problems? In the 1970s math was often taught with simple worksheets. One teacher was looking for a way to help his students have more ...