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Digit Sum

Age 14 to 16
ShortChallenge Level Yellow starYellow starYellow star
Secondary curriculum
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What is the sum of all the digits in all the numbers from one to one million?
You can find more short problems, arranged by curriculum topic, in our short problems collection.

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Magic Squares for Special Occasions

This article explains how to make your own magic square to mark a special occasion with the special date of your choice on the top line.

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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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