Evaluate
20\sqrt{2}\approx 28.284271247
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2\times 2\sqrt{5}\sqrt{5}\sqrt{2}
Factor 10=5\times 2. Rewrite the square root of the product \sqrt{5\times 2} as the product of square roots \sqrt{5}\sqrt{2}.
2\times 2\times 5\sqrt{2}
Multiply \sqrt{5} and \sqrt{5} to get 5.
4\times 5\sqrt{2}
Multiply 2 and 2 to get 4.
20\sqrt{2}
Multiply 4 and 5 to get 20.
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