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?

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

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

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

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

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

Choose four consecutive whole numbers. Multiply the first and last numbers together. Multiply the middle pair together. What do you notice?

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.

Take three whole numbers. The differences between them give you three new numbers. Find the differences between the new numbers and keep repeating this. What happens?

How many different colours of paint would be needed to paint these pictures by numbers?

Which of these triangular jigsaws are impossible to finish?

Starting with one of the mini-challenges, how many of the other mini-challenges will you invent for yourself?