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 138 by the denominator 7:
138 (numerator) ÷ 7 (denominator) = 19.71
As a result, you get 19.71 as your answer when you convert 3 117/7 (or 138/7) to a decimal.