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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?

Fives on the Clock

Age 7 to 11
Challenge Level

When does $5$ appear in the minutes display?
When does $5$ appear in the hours display?
How will you know that you have got all the different times?