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 126 by the denominator 25:
126 (numerator) ÷ 25 (denominator) = 5.04
As a result, you get 5.04 as your answer when you convert 3 51/25 (or 126/25) to a decimal.