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What Was in the Box?

This big box adds something to any number that goes into it. If you know the numbers that come out, what addition might be going on in the box?

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Cracking Codes

Jenny Murray describes how she developed her interest in making and breaking codes.

What's Happening?

Stage: 1 Challenge Level: Challenge Level:1

What is the difference between the first shape and the second shape?

Where has the extra piece been added?