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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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Can you find the values at the vertices when you know the values on the edges?

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Babylon Numbers

Stage: 3, 4 and 5 Challenge Level: Challenge Level:1
The Babylonians were interested in building. The maths in these tables helped them with this task. What maths might be relevant to this?