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 19806 by the denominator 149 (which you can enter in any calculator):
19806 (numerator) ÷ 149 (denominator) = 132.93
And finally, you get 132.93 as your answer when you convert 132 138/149 (or 19806/149) to a decimal.