Write a division problem by dividing a dividend by a divisor. For instance, if you have a recipe that calls for 3/4 cup of water and you want to cut the recipe in half, you would divide 3/4 by 2. You would write the problem as follows: 3/4 ("dividend") / 2/1 ("divisor") = __.
Flip the divisor to create a reciprocal fraction. In this example, you would flip 2/1 to create the fraction 1/2.
Multiply the dividend by the divisor's reciprocal. In this example, you would multiply 3/4 by 1/2. Multiply the numerators to get 3 and the denominators to get 8. This is the answer to your division problem. Using this example, 3/4 / 2/1 = 3/8.