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 7829 by the denominator 71 (which you can enter in any calculator):
7829 (numerator) ÷ 71 (denominator) = 110.27
And finally, you get 110.27 as your answer when you convert 109 90/71 (or 7829/71) to a decimal.