# How do you rationalize the denominator 1/sqrt11?

Multiply both numerator (top) and denominator (bottom) by $\sqrt{11}$:
$\frac{1}{\sqrt{11}} = \frac{1}{\sqrt{11}} \cdot \frac{\sqrt{11}}{\sqrt{11}}$
$= \frac{\sqrt{11}}{\sqrt{11} \cdot \sqrt{11}} = \frac{\sqrt{11}}{11}$