# Question #8b382

$- \frac{7}{2}$.
The reciprocal of a number is another number which has a product of $1$ when multiplied with the initial number. So if $a b = 1$ then $a$ is the reciprocal of $b$ and $b$ is the reciprocal of $a$. For fractions, reversing the numerator and the denominator is a quick way to intuitively find the reciprocal. To do so with a calculator, simply divide $1$ by the number you want to find the reciprocal of. Also, you can't divide by $0$ so $0$ is the reciprocal of no number (and likewise no number has a reciprocal equal to $0$)