To simplify the expression \(\frac{\sqrt{36}}{\sqrt{400}}\), we can follow these steps:
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Find the square roots:
- \(\sqrt{36} = 6\)
- \(\sqrt{400} = 20\)
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Express the quotient: \[ \frac{\sqrt{36}}{\sqrt{400}} = \frac{6}{20} \]
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Simplify the fraction: \[ \frac{6}{20} = \frac{3}{10} \quad \text{(dividing numerator and denominator by 2)} \]
Since the denominator \(10\) is not a radical, no further rationalization is necessary.
Thus, the final answer in simplest form is: \[ \frac{3}{10} \]