Zero is the only number that's its own opposite.
While 0 is technically not signed (it's neither positive nor negative), it meets the definition for being its own opposite because 0 + 0 = 0.
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They are 0 which is its own additive opposite. 0 does not have a multiplicative opposite.
It depends on what you mean by an opposite. Every real number has an additive opposite but 0 does not have a multiplicative opposite.
But it IS its own ADDITIVE opposite.
The opposite number of 9 is -9. In mathematics, the opposite of a number is the same distance from zero on the number line, but in the opposite direction. This is denoted by adding a negative sign in front of the number, indicating its direction opposite to the original number.
The answer depends on what you mean by the "opposite" of a number. A reciprocal is one type of opposite: it is the multiplicative opposite.