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Code Breaker
Age 7 to 11
Challenge Level 
Chris cracked the code!
I tried different pairs of prime numbers that it could be, until I found a pair that worked. The pair was 3 and 5, so I used 15 forwards on the red one, and got YOU HAVE UJSUCWV IT. So the third word was doubly encoded. Then I used 8 forwards on the blue one, and found that the third word was CRACKED.
I tried different pairs of prime numbers that it could be, until I found a pair that worked. The pair was 3 and 5, so I used 15 forwards on the red one, and got YOU HAVE UJSUCWV IT. So the third word was doubly encoded. Then I used 8 forwards on the blue one, and found that the third word was CRACKED.
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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'.