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The additive inverse of a number is the opposite of that number, that is, the additive inverse of a number x is -x. The sum of a number and its additive inverse is always zero, that is, x + (-x) = 0. Related Terms: addition, number, opposites, sum, zero. English | Espaol.
Inverse somewhat means the opposite. The inverse of addition is the opposite of addition which is subtraction (the opposite of adding 5 is subtracting 5). Subtraction undoes addition and vice versa. So they are inverse operations of each other. Another basic pair of inverse operations are multiplication and division.