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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?

Jumping

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?
The NRICH Project aims to enrich the mathematical experiences of all learners. To support this aim, members of the NRICH team work in a wide range of capacities, including providing professional development for teachers wishing to embed rich mathematical tasks into everyday classroom practice.
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NRICH is part of the family of activities in the Millennium Mathematics Project.