Improper fractions have a numerator that is greater than or equal to the denominator and can be converted to mixed numbers. To do so, divide the numerator by the denominator and write the whole number result with the remainder over the denominator. For example, an improper fraction of 15/4 would convert to a mixed number of 3 7/4 by dividing 15 by 4 to get 3 with a remainder of 3, written with the 3 and remainder over the original denominator.