sqrt(640) = sqrt(64*10) = sqrt(64)*sqrt(10) = 8*sqrt(10)
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The square root of 640 is: ± 25.298221
The square root of seven can not be simplified any further while still remaining exact.
The square root of 147, simplified, is: ± 12.1
The √35 is simplified, no perfect square can go into 35
The square root of 144 is 12 or -12.