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I find it interesting that the arithmetic operations which are more difficult for school children are also more difficult for computers (addition/subtraction < multiplication < division).

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Unless you’re talking about floating point in which case it’s multiplication < addition < division. But your point stands.

Multiplication/division include addition as a special case, at least if you allow adding 1:

a+b = a + a(b/a) = a(1 + (b/a))

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