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You could list all the properties of each number as a start.
Can you see some numbers which have the same property?
Sets of Numbers
Age 7 to 11
Challenge Level 
You could list all the properties of each number as a start.
Can you see some numbers which have the same property?
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Prime Magic
Place the numbers 1, 2, 3,..., 9 one on each square of a 3 by 3 grid so that all the rows and columns add up to a prime number. How many different solutions can you find?
Diagonal Trace
You can trace over all of the diagonals of a pentagon without lifting your pencil and without going over any more than once. Can the same thing be done with a hexagon or with a heptagon?