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Geoboards

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

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Polydron

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

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Multilink Cubes

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

Calcunos

Age 7 to 11 Challenge Level:
You could use sixteen sticks or headless matches to make the numbers.
How will you record what you've done?
How will you know when you have got all the possibilities?