Opposite of a number
The opposite of a number is a number on the number line that is the same distance from 0, but in the opposite direction. The sum of a number and its opposite is 0. Refer to the number line below.
+5 is the opposite of -5, and -5 is the opposite of +5 (+5 and -5 are called opposites, or opposite integers). +3.5 and -3.5 are opposites, but they are not opposite integers.
Also called opposite of a number.