A fraction is written in terms of two parts: the number on top is called the numerator and the number on the bottom is called the denominator. We can use the division method to solve this question. To get a decimal, simply divide the numerator 123 by the denominator 2:
123 (numerator) ÷ 2 (denominator) = 61.5
As a result, you get 61.5 as your answer when you convert 31 61/2 (or 123/2) to a decimal.