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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!

Playground Snapshot

Age 7 to 14 Challenge Level:

Emma T., Gavin T. and Keenan L. all gave brief descriptions of the structure - I suppose the next question should be - how many rods of what lengths have been used to make this frame?

Picture of frame

All of them identified the shape as a climbing frame. It has a hexagon shaped base with horizontal bars connected to vertical bars all like steps going upwards and no top. The sun is hitting it on the left side making the shadow fall onto the right.