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 129 by the denominator 18:
129 (numerator) ÷ 18 (denominator) = 7.17
As a result, you get 7.17 as your answer when you convert 5 39/18 (or 129/18) to a decimal.