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 101121 by the denominator 300 (which you can enter in any calculator):
101121 (numerator) ÷ 300 (denominator) = 337.07
And finally, you get 337.07 as your answer when you convert 337 21/300 (or 101121/300) to a decimal.