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â¢ ADDITIVE INVERSE (noun) The noun ADDITIVE INVERSE has 1 sense: 1. (mathematics) one of a pair of numbers whose sum is zero; the additive inverse of -5 is +5. Familiarity information: ADDITIVE INVERSE used as a noun is very rare. Dictionary entry details. â¢ ADDITIVE INVERSE (noun)
Best Answer: The additive inverse is what, when added to the original number, gives you 0. The multiplicative inverse is what, when multiplied by the original number, gives you 1. 1. 12.1. The additive inverse is -12.1. The multiplicative inverse is 1/12.1, or 10/121.