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 20686 by the denominator 150 (which you can enter in any calculator):
20686 (numerator) ÷ 150 (denominator) = 137.91
And finally, you get 137.91 as your answer when you convert 137 136/150 (or 20686/150) to a decimal.