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problem
Favourite

This Pied Piper of Hamelin

7 to 11
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Investigate the different numbers of people and rats there could have been if you know how many legs there are altogether!

Sending and Receiving Cards
problem

Sending and receiving cards

7 to 11
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This challenge asks you to investigate the total number of cards that would be sent if four children send one to all three others. How many would be sent if there were five children? Six?
Farey Fibonacci
problem

Farey Fibonacci

16 to 18
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Investigate Farey sequences of ratios of Fibonacci numbers.

Paper Curves
problem

Paper curves

7 to 11
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This is a simple paper-folding activity that gives an intriguing result which you can then investigate further.
Patience
game

Patience

11 to 14
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A simple game of patience which often comes out. Can you explain why?
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