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 51 by the denominator 15:
51 (numerator) ÷ 15 (denominator) = 3.4
As a result, you get 3.4 as your answer when you convert 3 6/15 (or 51/15) to a decimal.