The reciprocal of a number; the number, which when multiplied by a given number, produces the multiplicative identity 1; in the set of real numbers the number a given number needs to be multiplied by to yield 1.; n*n-inverse = 1 for all n. Examples: 7x1/7=1 and 2/3 * 3/2 = 1.
In mathematics, the reciprocal, or multiplicative inverse, of a number x is the number which, when multiplied by x, yields . The multiplicative inverse for the real numbers, for example, is 1/x. To avoid confusion by writing the inverse using set specific notation, we generally write x-1.