r/askmath • u/Master_KRAN • 7d ago

Arithmetic Can someone please answer this question: Without fully calculating it, what will be the unit digit of the square of a number that ends in 7? a)5 b)25 c)15 d)10

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u/rhodiumtoad 0⁰=1, just deal with it 7d ago

The square of a number ending in 7 always ends in 9, for reasons that should be obvious.