Evaluate
\frac{21\sqrt{10}}{100}\approx 0.664078309
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\frac{3\sqrt{10}\times 7}{10\times 10}
Multiply \frac{3\sqrt{10}}{10} times \frac{7}{10} by multiplying numerator times numerator and denominator times denominator.
\frac{21\sqrt{10}}{10\times 10}
Multiply 3 and 7 to get 21.
\frac{21\sqrt{10}}{100}
Multiply 10 and 10 to get 100.
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