I added together some of my neighbours house numbers. Can you explain the patterns I noticed?

The Number Jumbler can always work out your chosen symbol. Can you work out how?

Think of a number and follow the machine's instructions... I know what your number is! Can you explain how I know?

Think of a number and follow my instructions. Tell me your answer, and I'll tell you what you started with! Can you explain how I know?

Take a look at the video and try to find a sequence of moves that will untangle the ropes.

It would be nice to have a strategy for disentangling any tangled ropes...

What is the smallest number of answers you need to reveal in order to work out the missing headers?

Try entering different sets of numbers in the number pyramids. How does the total at the top change?

When number pyramids have a sequence on the bottom layer, some interesting patterns emerge...

Can you find the hidden factors which multiply together to produce each quadratic expression?