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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.
The additive inverse property of any number is the same number with the opposite sign. When a number and its additive inverse are added to one another, the result is always 0 (zero) - the identity element for addition. The additive inverse property of 12 is -12, AND the additive inverse property of -12 is 12.