To take a square root of a decimal that can be taken the square root fully, in other words not an irrational number, one can write the decimal as a fraction then take the square root of both the top and bottom values.
For example : sq. root of 0.5
Sq root (1/2) = sq. root of 1/sq root of 2
1/ sq root of 2 or sq. root or 2/2.
