Answer
Reciprocal
Work Step by Step
The reciprocal of a number is a number or expression that you can multiply by it to get 1.
Since $b=\frac{b}{1}$, and you need to get the numerator and the denominator to equal the same thing so that the expression equals one, the reciprocal of $\frac{b}{1}$ is $\frac{1}{b}$ for any nonzero number $b$.
$\frac{b}{1}\times\frac{1}{b}=\frac{b}{b}$, or $1$.
