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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!

Taking Steps

Stage: 2 Challenge Level: Challenge Level:1
In the circles picture there are 28 in the first ?level? of the picture, then 3 more lots of 28 at the next level.

Can you imagine it?

What about the next level?