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

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

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Tangram Paradox

How can the same pieces of the tangram make this bowl before and after it was chipped? Use the interactivity to try and work out what is going on!

Right or Left?

Age 7 to 11 Challenge Level:

If you are having trouble with the visualisation and you don't have left-handed and right-handed dice, you could stick spots onto cubes to help.

Alternatively, print off this sheet which has a net of a right-hand dice on the first page and a net of a left-handed dice on the second.