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  • Early Years Foundation Stage

Some Secret Codes

Age 7 to 11
Challenge Level Yellow starYellow starYellow star
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You could try writing the letters round in a circle so that it is easier to count forwards and backwards. Use the wheel we have created to help you.


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Numbered Cars

I was looking at the number plate of a car parked outside. Using my special code S208VBJ adds to 65. Can you crack my code and use it to find out what both of these number plates add up to?

Unlocking the Case

A case is found with a combination lock. There is one clue about the number needed to open the case. Can you find the number and open the case?

James's Code Challenge

The Enigma Project's James Grime has created a video code challenge. Watch it here!

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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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