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The additive inverse of 18 is -18. The additive inverse of any number is the opposite of that number, such that the sum of the original number and the additive inverse is zero.
Change its sign.
The additive inverse of x is -(x), so the additive inverse of -45 is -(-45), or 45.
-1 is the additive inverse of 1.
-35 The additive inverse of a number is the number that will equal 0 when added to the original number so the additive inverse of 3 is -3 the additive inverse of 782 is -782 etc.