This article takes the reader through divisibility tests and how they work. An article to read with pencil and paper to hand.
In this article for teachers, Bernard Bagnall describes how to find digital roots and suggests that they can be worth exploring when confronted by a sequence of numbers.
It starts quite simple but great opportunities for number discoveries and patterns!
In this investigation, we look at Pascal's Triangle in a slightly different way - rotated and with the top line of ones taken off.