Evaluate
\frac{7\sqrt{3}}{9}\approx 1.347150628
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\frac{\sqrt{21}}{3\times 3}\sqrt{7}
Express \frac{\frac{\sqrt{21}}{3}}{3} as a single fraction.
\frac{\sqrt{21}}{9}\sqrt{7}
Multiply 3 and 3 to get 9.
\frac{\sqrt{21}\sqrt{7}}{9}
Express \frac{\sqrt{21}}{9}\sqrt{7} as a single fraction.
\frac{\sqrt{7}\sqrt{3}\sqrt{7}}{9}
Factor 21=7\times 3. Rewrite the square root of the product \sqrt{7\times 3} as the product of square roots \sqrt{7}\sqrt{3}.
\frac{7\sqrt{3}}{9}
Multiply \sqrt{7} and \sqrt{7} to get 7.
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