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 400 by the denominator 840:
400 (numerator) ÷ 840 (denominator) = 0.48
As a result, you get 0.48 as your answer when you convert 400/840 to a decimal.