Multiply the whole number in a mixed number by the denominator and add the result to the numerator to convert from a mixed number to a fraction. For example, if you started with 6 4/5, multiply 6 by 5 to get 30 and add 30 to 4 to find the equivalent fraction is 34/5.
Divide the numerator by the denominator to find the fraction expressed as a decimal. In this example, divide 34 by 5 to get 6.8.
Multiply the result by 100 to convert to a percentage. In this example, multiply 6.8 by 100 to find 6 4/5 equals 680 percent.