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 81 by the denominator 139:

81 (numerator) ÷ 139 (denominator) = 0.58

As a result, you get 0.58 as your answer when you convert 81/139 to a decimal.