This game challenges you to locate hidden triangles in The White Box by firing rays and observing where the rays exit the Box.

Is this a fair game? How many ways are there of creating a fair game by adding odd and even numbers?

This interactivity invites you to make conjectures and explore probabilities of outcomes related to two independent events.

Many numbers can be expressed as the sum of two or more consecutive integers. For example, 15=7+8 and 10=1+2+3+4. Can you say which numbers can be expressed in this way?

Charlie has made a Magic V. Can you use his example to make some more? And how about Magic Ls, Ns and Ws?

It's easy to work out the areas of most squares that we meet, but what if they were tilted?

Imagine we have four bags containing a large number of 1s, 4s, 7s and 10s. What numbers can we make?

Polygons drawn on square dotty paper have dots on their perimeter (p) and often internal (i) ones as well. Find a relationship between p, i and the area of the polygons.