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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.
opposite
usually this means positive numbers and their negative counterparts. The opposite of a number is its additive inverse. The sum of a number and its opposite is zero. (This is sometimes called the property of opposites, or additive inverse property). Example: -999 + 999 = 0; therefore -999 and 999 are additive inverse (1/3) + (-1/3) = 0; therefore 1/3 and -1/3 are additive inverse 1 + (-1) = 0; therefore 1 and -1 are additive inverse a + (-a) = 0; therefore a and -a are additive inverse, So, the opposite of -999 is 999; the opposite of 1/3 is -1/3; the opposite of 1 is -1, and the opposite of a is -a.
Two numbers that are the same distance from zero on the number line but are on opposite sides of zero are opposite numbers, or opposites. The opposite of a number is called its additive inverse. The opposite of 78 is -78.
These are often called "opposite numbers". The more precise term is "additive inverse". For example, the additive inverse of 5 is minus 5.