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Construct-o-straws

Make a cube out of straws and have a go at this practical challenge.

Matchsticks

Reasoning about the number of matches needed to build squares that share their sides.

Little Boxes

How many different cuboids can you make when you use four CDs or DVDs? How about using five, then six?

Tetrahedron Faces

Age 7 to 11
Challenge Level
Where could the other colours go?
Can you find another way?
How do you know the tetrahedra are different?
How will you record your tetrahedra?