Evaluate
\frac{\sqrt{5}}{5}\approx 0.447213595
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0.1\times 2\sqrt{5}
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}.
0.2\sqrt{5}
Multiply 0.1 and 2 to get 0.2.
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