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Additive Opposite
An opposite of a number is the number with the opposite sign, but same absolute value.
Basically, 3 has the opposite -3, -47's opposite is 47 (opposite of n is -n).
Just take 0-(n) where n is the number in question (there is no opposite for 0).
Usually it means the opposite sign -- if originally positive, the opposite is a negative; if originally negative, the opposite is positive.
Multiplicative Opposite
The reciprocal of a number n is 1/n so that multiplication or division by a number is the inverse (division or multiplication) using its reciprocal.
Example : 7 divided by 1/3 is equal to 7 times 3 = 21 (there are 21 one-thirds in 7).
By itself, nothing. There are different meanings in different contexts.
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