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Where Can We Visit?

Charlie and Abi put a counter on 42. They wondered if they could visit all the other numbers on their 1-100 board, moving the counter using just these two operations: x2 and -5. What do you think?

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Babylon Numbers

Can you make a hypothesis to explain these ancient numbers?

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Ishango Bone

Can you decode the mysterious markings on this ancient bone tool?

In the Bag

Age 11 to 14 Challenge Level:

The sets of 10 marbles are chosen randomly, so could contain:
4 red, 3 green, 2 blue and 1 yellow or
4 red, 3 green and 3 yellow or
7 red and 3 blue or...

A run of 10 viewings may produce an outcome that is not representative of the actual contents of the bag.