High Quality Content by WIKIPEDIA articles! In mathematics, the additive inverse, or opposite, of a number a is the number that, when added to a, yields zero. The additive inverse of F is denoted ?F. For example, the additive inverse of 7 is ?7, because 7 + (?7) = 0, and the additive inverse of ?0.3 is 0.3, because ?0.3 + 0.3 = 0. In other words, the additive inverse of a number is the number's negative. For example, the additive inverse of 8 is ?8, the additive inverse of 10002 is ?10002 and the additive inverse of x is ?(x ). The additive inverse of a number is defined as its inverse element under the binary operation of addition. It can be calculated using multiplication by ?1; that is, ?n = ?1 x n.

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