Solve 1/sqrt{20}

$$\frac { 1 } { \sqrt { 20 } }$$

Evaluate

$$\frac{\sqrt{5}}{10}\approx 0.223606798$$

Solution Steps

Factor 20=2^{2}\times 5. Rewrite the square root of the product \sqrt{2^{2}\times 5} as the product of square roots \sqrt{2^{2}}\sqrt{5}. Take the square root of 2^{2}.

$$\frac{1}{2\sqrt{5}}$$

Rationalize the denominator of \frac{1}{2\sqrt{5}} by multiplying numerator and denominator by \sqrt{5}.

$$\frac{\sqrt{5}}{2\left(\sqrt{5}\right)^{2}}$$

The square of \sqrt{5} is 5.

$$\frac{\sqrt{5}}{2\times 5}$$

Multiply 2 and 5 to get 10.

$$\frac{\sqrt{5}}{10}$$