We are going to calculate the square root of a specific number. It is better to make sure that the number could be calculated at ease.
Put the number, which you would like to calculate its square root.
Click on the column beside it, and type in =SQRT(column with the number that you would like to know the square root of, for example A1.)
Formula in the picture below is =SQRT(A1)
Check also nth root calculator.