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 142 by the denominator 7:
142 (numerator) ÷ 7 (denominator) = 20.29
As a result, you get 20.29 as your answer when you convert 8 86/7 (or 142/7) to a decimal.