If you've had a go at all the ones above, here are some more ideas to try...
problem
Favourite
The puzzling sweet shop
Age
5 to 11
Challenge level
There were chews for 2p, mini eggs for 3p, Chocko bars for 5p and lollypops for 7p in the sweet shop. What could each of the children buy with their money?
problem
Favourite
What's it worth?
Age
11 to 16
Challenge level
There are lots of different methods to find out what the shapes are worth - how many can you find?