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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.
Identity Properties for the set of all Real Numbers. An additive identity is a number that can be added to any number without changing the value of that other number. The additive identity for the set of all real numbers is 0 (zero). The number 0 can be added to any real number without changing its value.