Posing the question in the spirit of "whether it is necessary to know the math" is incorrect. theorems and proofs not need to know, need to understand a few intuitive practical applications, and that no higher education available to everyone. in principle, in the words "bank ratio odds" laid most of them.
Many do it intuitively, not necessarily to calculate the percentage to two decimal places, you should estimate approximately the same And by the way in poker math curriculum, so do not be afraid