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 149 by the denominator 4 (which you can enter in any calculator):
149 (numerator) ÷ 4 (denominator) = 37.25
And finally, you get 37.25 as your answer when you convert 12 101/4 (or 149/4) to a decimal.