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A farmer is supplying a mix of seeds, nuts and dried apricots to a manufacturer of crunchy cereal bars. What combination of ingredients costing £5 per kg could he supply?

Can you describe a piece of paper clearly enough for your partner to know which piece it is?

In the binary number system, we only use the digits 0 and 1. What can you discover about this system?

Tim had nine cards. How could he have put them into three piles so that the total in each pile was 15?

A man has 5 coins in his pocket. Given the clues, can you work out what the coins are?

Why does the tower look a different size in each of these pictures?

In this short problem we investigate the tensions and compressions in a framework made from springs and ropes.

The Tower of Hanoi is an ancient mathematical challenge.