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 121 by the denominator 8:
121 (numerator) ÷ 8 (denominator) = 15.13
As a result, you get 15.13 as your answer when you convert 13 17/8 (or 121/8) to a decimal.