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 ...

One of the most magical aspects of mathematics is the ability for complex and intricate structures to emerge from the simplest of rules. Few mathematical objects are simpler to create – and few weave ...