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 66 by the denominator 9:
66 (numerator) ÷ 9 (denominator) = 7.33
As a result, you get 7.33 as your answer when you convert 3 39/9 (or 66/9) to a decimal.