Reduce the fraction $\frac{135}{1215}$ to lowest terms by extracting and canceling out $135$.
$$135\sqrt{\frac{1}{9}}$$
Rewrite the square root of the division $\frac{1}{9}$ as the division of square roots $\frac{\sqrt{1}}{\sqrt{9}}$. Take the square root of both numerator and denominator.
$$135\times \frac{1}{3}$$
Multiply $135$ and $\frac{1}{3}$ to get $\frac{135}{3}$.