Evaluate
\frac{20\sqrt{13}}{169}\approx 0.426692459
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\frac{20\sqrt{13}}{13\left(\sqrt{13}\right)^{2}}
Rationalize the denominator of \frac{20}{13\sqrt{13}} by multiplying numerator and denominator by \sqrt{13}.
\frac{20\sqrt{13}}{13\times 13}
The square of \sqrt{13} is 13.
\frac{20\sqrt{13}}{169}
Multiply 13 and 13 to get 169.
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