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Code Breaker
Age 7 to 11
Challenge Level 
Make a list of all the prime numbers less than 10.
What are the different multiplication combinations you need to
try?
Remember if the code was made by shifting the letters forward, to break the code you will need to shift the letters by the same number but backwards.
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Prompt Cards
These two group activities use mathematical reasoning - one is numerical, one geometric.
Round and Round the Circle
What happens if you join every second point on this circle? How about every third point? Try with different steps and see if you can predict what will happen.
Tom's Number
Work out Tom's number from the answers he gives his friend. He will only answer 'yes' or 'no'.