How do you find the square root of 54?
If you want an approximate value, then so long as you have memorised approximate values for
#sqrt(2) ~~ 1.414213562373#
#sqrt(3) ~~ 1.73205080756#
Alternatively you could use a Newton Raphson type method, such as the one I describe in http://socratic.org/questions/how-do-you-find-the-square-root-28
If you started with