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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!

Regular Rings 2

Age 7 to 11 Challenge Level:
One of the four folds is 'undone' along the way.
What do you notice about the different types of fold on the crease pattern?   Can you tell which direction each fold is in?
What order do you think the folds were made in?
How could we check what we’ve done so far?