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 6708 by the denominator 81 (which you can enter in any calculator):
6708 (numerator) ÷ 81 (denominator) = 82.81
And finally, you get 82.81 as your answer when you convert 82 66/81 (or 6708/81) to a decimal.