Multiplicative inverse

Number which when multiplied by x equals 1

In mathematics, a multiplicative inverse or reciprocal for a nonzero number x, denoted by 1 x {\displaystyle {\tfrac {1}{x}}} or x−1, is a number which when multiplied by x yields the multiplicative identity, 1. The multiplicative inverse of a fraction a b {\displaystyle {\tfrac {a}{b}}} is b a . {\displaystyle {\tfrac {b}{a}}.} Dividing 1 by a real number yields its multiplicative inverse.

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