Determine your ratio. For example, assume your ratio is 9 out of 10.
Multiply the numerator and the denominator by the same number. For example, 9 times 10 equals 90 and 10 times 10 equals 100, so the new ratio is 90 out of 100.
Divide the numerator and denominator of the ratio by the same number to reduce the ratio. In the example, 90 divided by 50 equals 1.8 and 100 divided by 50 equals 2, so your ratio is 1.8 out of 2.
