problem

### Adding machine

Can you set the logic gates so that this machine can decide how many bulbs have been switched on?

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Adding machine

Can you set the logic gates so that this machine can decide how many bulbs have been switched on?

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Five More Coins

Could Ben have any amount of money between 5p and £2 in his pocket if he has five coins?

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Phiddlywinks - a tribute to John Conway

Read this article to find out more about the inspiration for NRICH's game, Phiddlywinks.

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Are you well Balanced?

Can you work out how to make each side of this balance equally balanced? You can put more than one weight on a hook.

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Charitable Pennies

Investigate the different ways that fifteen schools could have given money in a charity fundraiser.

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Rod Area

This task challenges you to create symmetrical U shapes out of rods and find their areas.