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 42 by the denominator 21:
42 (numerator) ÷ 21 (denominator) = 2
As a result, you get 2 as your answer when you convert 42/21 to a decimal.