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5 squared is 25, and 6 squared is 36.

So the square root of 30 has to be between 5 and 6. Since 30 is fairly close to midway between 25 and 36, 5.5 would be a reasonable estimate.

(My calculator tells me that the answer is approximately 5.477, so 5.5 is quite good.)

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16y ago

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Q: How do you estimate the square root of 30?
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