Answer
$\frac{180}{1}$
Work Step by Step
First write this fraction: $\frac{2160}{12}$.
Then, keep reducing until you can't anymore to get the simplest form.
$2160$ $\div$ $12$ $=$ $180$
$12$ $\div$ $12$ $=$ $1$
$\frac{180}{1}$ is your answer.