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Number and algebra

The Number System and Place Value
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Fractions, Decimals, Percentages, Ratio and Proportion
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Angles, Polygons, and Geometrical Proof
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Handling, Processing and Representing Data
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For younger learners

Early Years Foundation Stage

A Frosty Puddle

Age 16 to 18

Challenge Level Yellow star

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Well done to Moosa from St. Olave's Grammar School in the UK who sent this full solution. Click here to see a larger version.

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Accessibility Statement
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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.