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Rowan from St Andrews tried this at home and the adult with him sent in pictures of his work.  The adult wrote out Rowan's explanations in green:

   

Well done Rowan - you have explained your reasoning very clearly.

You may be able to find other ways of getting to an answer.


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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.

NRICH is part of the family of activities in the Millennium Mathematics Project.

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