# How do I find the logarithm log_3 1/81?

The answer is $0$.
${\log}_{3} \left(1\right)$ is the same as saying $3$ to the what power is $1$?
Anything to the 0th power is $1$, so ${\log}_{3} \left(1\right) = 0$
$\frac{0}{81}$ is simply $0$.