You could try something like 4^10 which they might be able to scrutinise after writing it as 4x4x4x4x4x4x4x4x4x4.
I would have thought some nice conjectures might arise (without the debilitating multi-choice), which could then be scrutinsed further.
ProfSmudge
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School maths should be more than tables and algorithms. I try to write materials that show that. Dietmar Küchemann
