0 is its own additive inverse. There is no multiplicative inverse for 0.
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the number 0 is always equal to its opposite
When the number is 0.
The opposite of 243 is -243.
It would be 0, which is also its opposite.
Zero has no multiplicative opposite (or inverse). However, it has an additive inverse, and that is also zero, since 0 + 0 = 0 The opposite value of a null set would be an infinite set, but infinity is not a real number. The opposite of zero in binary coding is one (on vs. off).