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 13975 by the denominator 99 (which you can enter in any calculator):
13975 (numerator) ÷ 99 (denominator) = 141.16
And finally, you get 141.16 as your answer when you convert 140 115/99 (or 13975/99) to a decimal.