One method to convert 400/840 to a decimal is by using the division method. Before we move ahead to the method, here is a quick recap on fractions: A fraction is a number representation that is broken down into two parts - the number on top is called the numerator, and the number on the bottom is called the denominator. To get a decimal using the division method, simply divide the numerator 400 by the denominator 840:
400 (numerator) ÷ 840 (denominator) = 0.48
And there you go! We got 0.48 as the answer when you convert 400/840 to a decimal.