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


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?

Playground Snapshot

Age 7 to 14
Challenge Level

The image below is part of a piece of equipment found in the playground of a London school.

Playground frame

  • What do you think it is used for?
  • What is the shape of its base?
  • How would you describe it to someone over the phone?
  • Where was the sun, that created such strong shadows, in relation to the 3D structure?

Try to draw a picture of the whole structure from the information you have.

You might also like to make a model of it and shine a light onto it to reproduce all the shadows.