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 10879 by the denominator 108 (which you can enter in any calculator):
10879 (numerator) ÷ 108 (denominator) = 100.73
And finally, you get 100.73 as your answer when you convert 100 79/108 (or 10879/108) to a decimal.