These two group activities use mathematical reasoning - one is
numerical, one geometric.
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.
Work out Tom's number from the answers he gives his friend. He will
only answer 'yes' or 'no'.
Make a list of all the prime numbers less than 10.
What are the different multiplication combinations you need to
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.