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 21 by the denominator 6:
21 (numerator) ÷ 6 (denominator) = 3.5
As a result, you get 3.5 as your answer when you convert 21/6 to a decimal.