Write out all of the factors that the numerator and denominator are divisible by. Start with the smallest number and keep dividing the remaining total until it can be divided no further. For instance, use the improper fraction 110/35. The number 110 is divisible by 1, 110, 2, 55, 5 and 11. The number 35 is divisible by 1, 35, 5 and 7.
Divide both the numerator and denominator by the greatest common factor. The GCF is the largest number that both the numerator and denominator are divisible by. In this example, both the 110 and 35 are divisible by 1 and 5, with 5 being the GCF. So, 110 divided by 5 equals 22 and 35 divided by 5 equals 7. The improper fraction can be reduced to 22/7.
Divide the numerator by the denominator. In the example, 22 divided by 7 equals 3 with a remainder of 1.
Write out the fraction so that the whole number is first and the remainder is written as a fraction. In the example, 22/7 equals 3 1/7. Therefore, the improper fraction of 110/35 can be expressed as a reduced mixed fraction by writing it as 3 1/7.