Evaluate square root of 16/81

$\sqrt{\frac{16}{81}}$

Rewrite $\sqrt{\frac{16}{81}}$ as $\frac{\sqrt{16}}{\sqrt{81}}$ .

$\frac{\sqrt{16}}{\sqrt{81}}$

Simplify the numerator.

Rewrite $16$ as $4^{2}$ .

$\frac{\sqrt{4^{2}}}{\sqrt{81}}$

Pull terms out from under the radical, assuming positive real numbers.

$\frac{4}{\sqrt{81}}$

Simplify the denominator.

Rewrite $81$ as $9^{2}$ .

$\frac{4}{\sqrt{9^{2}}}$

Pull terms out from under the radical, assuming positive real numbers.

$\frac{4}{9}$

The result can be shown in multiple forms.

Exact Form:

$\frac{4}{9}$

Decimal Form:

$0.\overline{4}$