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 143 by the denominator 7:
143 (numerator) ÷ 7 (denominator) = 20.43
As a result, you get 20.43 as your answer when you convert 12 59/7 (or 143/7) to a decimal.