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Both of those numbers are perfect squares, so square root each number separately and you will get your answer.
√(81/100) = √81 / √100 = 9/10 = 0.9

Don't know how far you've progressed as technically the answer is ± 0.9, but you may not have reached the stage of dealing with negative square roots of positive numbers.

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Q: What is the square root of 81 over 100?
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