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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!

Peg Rotation

Stage: 2 Challenge Level: Challenge Level:3 Challenge Level:3 Challenge Level:3

You might find it useful to draw a grid on an OHT or some tracing paper which you can see through.
Can you visualise the movements of each grid before physically checking?
Try matching up the dots on the original picture with the dots on the new image. It might help just to have the two pictures side-by-side.