the reciprocal
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Opposite.
It's Inverse
As far as positive numbers are concerned, the additive inverse of a positive number is a negative number with the same magnitude (i.e. the additive inverse of 5 is -5). It would be wrong to simply say that "negative" and "additive inverse" are correct, because the additive inverse of a negative number is a positive number.
reciprocal is the multiplicative inverse.
Another name for multiplicative inverse is reciprocal. Basically, you write the number as a fraction and you reverse the numerator and the denominator. In this case, the multiplicative inverse is 1/5340.