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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!

Knight's Swap

Stage: 2 Challenge Level: Challenge Level:1
You might like to draw a square and use some counters to help you see the moves.
How will you record what you've done?