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 111 by the denominator 20:
111 (numerator) ÷ 20 (denominator) = 5.55
As a result, you get 5.55 as your answer when you convert 3 51/20 (or 111/20) to a decimal.