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The additive number is 0.
-27's additive inverse is 27 because when you add them together you get the additive identity, 0.
0. By the definition of "additive inverse", the sum of ANY number and its additive inverse must be 0.
The additive inverse is a number subtracted it's self is 0: x + (-x) = 0 The additive identity is a number plus/minus 0 is itself: x +/- 0 = x They're very similar
When a number is added to its additive inverse, the result is always 0.