### 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.

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

# Weekly Problem 20 - 2007

##### Stage: 2 and 3 Challenge Level:

In this addition each letter stands for a different digit, with $S$ standing for 3. What is the value of $Y\times O$?
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 Â Â S O Â M A N Y + -- -- -- -- -- S U M S Â

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If you liked this problem, here is an NRICH task which challenges you to use similar mathematical ideas.

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This problem is taken from the UKMT Mathematical Challenges.

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