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You could get a feel for this problem by sorting the shapes into three piles according to colour and then sorting them into the three shapes.
You could choose two cards and think about what is the same/different about them. This may help you find others which are the same/different too.
How many different ways can you find to join three equilateral triangles together? Can you convince us that you have found them all?
This challenge involves eight three-cube models made from interlocking cubes. Investigate different ways of putting the models together then compare your constructions.
Two children made up a game as they walked along the garden paths. Can you find out their scores? Can you find some paths of your own?