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Number Squares

Start with four numbers at the corners of a square and put the total of two corners in the middle of that side. Keep going... Can you estimate what the size of the last four numbers will be?

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Big Dog, Little Dog

Age 5 to 7
Challenge Level

Liam from Cummersdale School, Carlisle, Cumbria says:

"I have the answer to your solution for big dog little dog.
Big Dog has 10 biscuits and Little Dog has 6 biscuits."


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.