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 78 by the denominator 20:
78 (numerator) ÷ 20 (denominator) = 3.9
As a result, you get 3.9 as your answer when you convert 2 38/20 (or 78/20) to a decimal.