Mini Cross-Number

Which digit replaces x in this crossnumber?
Exploring and noticing Working systematically Conjecturing and generalising Visualising and representing Reasoning, convincing and proving
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Problem



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

Image
Mini Cross-Number


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