Well first you have to get 0.4 and turn that decimal into a fraction which will be 2/5 and that fraction is already at its simplest form and cant be reduced so your answer is both 0.4 and 2/5.
The easiest form would be 4/10 and you can divide numerator (top number) and denominator (bottom number) by 2 and get 2/5. the most simple from for the decimal 0.4 is 2/5
