Evaluate
\frac{2\sqrt{85}}{85}\approx 0.216930458
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\frac{16}{8\sqrt{85}}
Calculate the square root of 64 and get 8.
\frac{16\sqrt{85}}{8\left(\sqrt{85}\right)^{2}}
Rationalize the denominator of \frac{16}{8\sqrt{85}} by multiplying numerator and denominator by \sqrt{85}.
\frac{16\sqrt{85}}{8\times 85}
The square of \sqrt{85} is 85.
\frac{2\sqrt{85}}{85}
Cancel out 8 in both numerator and denominator.
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