Evaluate
\frac{\sqrt{5}}{20}\approx 0.111803399
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\frac{\sqrt{5}}{4\left(\sqrt{5}\right)^{2}}
Rationalize the denominator of \frac{1}{4\sqrt{5}} by multiplying numerator and denominator by \sqrt{5}.
\frac{\sqrt{5}}{4\times 5}
The square of \sqrt{5} is 5.
\frac{\sqrt{5}}{20}
Multiply 4 and 5 to get 20.
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