# Category: Grids Multiply

## Turning times tables inside out

Challenge On Boarding – Is it a factor? Divisibility Take a number, say 45. Just looking at it can get you some information about its factors. For example, it is an odd number, which just…

## The X factors (and products)

This series of challenges are based on multiplication tables and mainly introduce the idea that you can create your own tables by choosing the factors and working out all the products. Challenge On Boarding –…

## A Twenty-something Quadrant

Challenge On Boarding – Orientation of Lines The orientation of a line is the direction that the line goes in or could be considered as the angle that the line makes with the axes on…