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 138 by the denominator 21:
138 (numerator) ÷ 21 (denominator) = 6.57
As a result, you get 6.57 as your answer when you convert 138/21 to a decimal.