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'Mini Cross-number' printed from https://nrich.maths.org/

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What is the digit x in this cross-number?

Across                  Down
1. A cube              1. One less than a cube
3. A cube              2. A number














If you liked this problem, here is an NRICH task that challenges you to use similar mathematical ideas.


 
This problem is taken from the UKMT Mathematical Challenges.
You can find more short problems, arranged by curriculum topic, in our short problems collection.