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Escape from the Castle

Skippy and Anna are locked in a room in a large castle. The key to that room, and all the other rooms, is a number. The numbers are locked away in a problem. Can you help them to get out?


Age 7 to 11
Challenge Level
Use anything that you like to help you - pictures, number lines, a whiteboard for jottings ...
Is your answer sensible?  Does it seem about the right size?