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 63 by the denominator 4 (which you can enter in any calculator):
63 (numerator) ÷ 4 (denominator) = 15.75
And finally, you get 15.75 as your answer when you convert 15 3/4 (or 63/4) to a decimal.