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 122 by the denominator 21:
122 (numerator) ÷ 21 (denominator) = 5.81
As a result, you get 5.81 as your answer when you convert 3 59/21 (or 122/21) to a decimal.