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 126 by the denominator 39:
126 (numerator) ÷ 39 (denominator) = 3.23
As a result, you get 3.23 as your answer when you convert 3 9/39 (or 126/39) to a decimal.