Use a calculator. There are methods based on a process somewhat like long division, or based on "trial and improvement" but neither is user-friendly.
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Square root of 40 approximately = 6.324555325 / square root of 40 = 0.790569415
NO!!! '40' is the square root of '1600' The square root of '600' is 24.49489743...
No - remember that you cannot have a negative square root. Instead, the square root should be +40 as opposed to -40.
The square root of 1600 is 40, therefore the square root of -1600 is 40i, where "i" is the imaginary unit.
Take out the largest perfect square you can find, in this case, 4: root(40) = root(4 x 10) = root(4) x root(10) = 2 x root(10).