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\frac{\sqrt{8}}{\sqrt{45}}
Rewrite the square root of the division \sqrt{\frac{8}{45}} as the division of square roots \frac{\sqrt{8}}{\sqrt{45}}.
\frac{2\sqrt{2}}{\sqrt{45}}
Factor 8=2^{2}\times 2. Rewrite the square root of the product \sqrt{2^{2}\times 2} as the product of square roots \sqrt{2^{2}}\sqrt{2}. Take the square root of 2^{2}.
\frac{2\sqrt{2}}{3\sqrt{5}}
Factor 45=3^{2}\times 5. Rewrite the square root of the product \sqrt{3^{2}\times 5} as the product of square roots \sqrt{3^{2}}\sqrt{5}. Take the square root of 3^{2}.
\frac{2\sqrt{2}\sqrt{5}}{3\left(\sqrt{5}\right)^{2}}
Rationalize the denominator of \frac{2\sqrt{2}}{3\sqrt{5}} by multiplying numerator and denominator by \sqrt{5}.
\frac{2\sqrt{2}\sqrt{5}}{3\times 5}
The square of \sqrt{5} is 5.
\frac{2\sqrt{10}}{3\times 5}
To multiply \sqrt{2} and \sqrt{5}, multiply the numbers under the square root.
\frac{2\sqrt{10}}{15}
Multiply 3 and 5 to get 15.