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 124 by the denominator 20:
124 (numerator) ÷ 20 (denominator) = 6.2
As a result, you get 6.2 as your answer when you convert 3 64/20 (or 124/20) to a decimal.