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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!

Drilling Many Cubes

Age 7 to 14 Challenge Level:

Here we see the two kinds of drilling with the green cubes showing those that have been drilled through.

drilled cubes