A fraction is usually split into two parts: the first part is the number on top, called the numerator; and the second part is the number on the bottom, called the denominator. These are both separated by a line called the “divisor line”. We can use the division method help to solve this question: to get a decimal, simply divide the numerator 25639 by the denominator 125 (which you can enter in any calculator):
25639 (numerator) ÷ 125 (denominator) = 205.11
And finally, you get 205.11 as your answer when you convert 203 264/125 (or 25639/125) to a decimal.