What's 0.4 in a fraction in the simplest form?

Using the place value chart, we can see that the decimal 0.4 is four tenths, so we can write 0.4 as the fraction . Notice however that the fraction is not in lowest terms. We will need to divide the numerator and the denominator by the greatest common factor of 4 and 10 which is 2. Therefore, 0.4 can be written as the fraction , which is in lowest terms.