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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.
Best Answer: The additive inverse is just like changing the sign of the number. For example, if it is positive, make it negative and if it is negative, the additive inverse of that number is it in positive.