### Geoboards

This practical challenge invites you to investigate the different squares you can make on a square geoboard or pegboard.

### Polydron

This activity investigates how you might make squares and pentominoes from Polydron.

### Multilink Cubes

If you had 36 cubes, what different cuboids could you make?

# Fifteen Cards

##### Stage: 2 Challenge Level:

Remember that there is only one of each number from $1 - 15$.

You can download a set of cards numbered $1 - 15$ here.

How will you remember which combinations you have tried?