For the square root of a fraction, you could divide the fraction (top divided by the bottom) and then find the square root of the quotient. 9 divided by 16 is 0.5625, and the square root of 0.5625 is 0.75. / / / / For the other way to do it, you have to know that the square root of a fraction is the same thing as the square root of the top over the square root of the bottom. So the sqrt (9/16) = sqrt (9)/sqrt (16) = 3/4. (same thing as 0.75 .)