_sub·trac·tion

 

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Subtraction

–noun, an act or instance of subtracting.

Subtraction is the inverse of addition, meaning that if we start with any number and add any number and then subtract the same number we added, we return to the number we started with. It is often useful to view or even define subtraction as a kind of addition, the addition of the additive inverse.

From Wikipedia, the free encyclopedia.