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The answer depends on the context. Numbers have different opposites with regard to different operations. The basic characteristic is that the number and its opposite will combine, using that operation, to form the identity.

For example,

the additive opposite of 4 is -4 (identity = 0)

the multiplicative opposite of 4 is 0.25 (identity = 1)

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Q: What is a characteristic of opposite in math?
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