You do not need to estimate it because it is so easy to work out the exact answer!
9*9 = 81 so sqrt(81) = 9 and so 3*sqrt(81) = 3*9 = 27
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Square root 64 and square root 81
Square root of 64 and square root of 81, perhaps.
The square root of -81 = 9 i9i
The square root of 81 is 9
The square root of 6561 is 81