In math, a fraction is one way to express a number that is less than one. All fractions can easily be converted in percents using standard division.
Take the fraction and divide the numerator (the number on top) by the denominator (the number on bottom) resulting in a decimal. For example, using the fraction 7/10, divide 7 by 10, yielding the decimal .7. For conversion purposes, if the resulting decimal has only a tenths place (or one number after the decimal point) add a zero. So .7 becomes .70.
Move the decimal two places to the right. This is because a percentage is an expression of a number as part of 100. Using the decimal .70 and moving the decimal two places to the right to the hundredths place yields a result of 70. This is the percentage of the fraction 7/10 expressed as a percent.
Use this method on fractions that have resulting decimals of more than two digits. For example, the fraction 5/8. Divide the numerator (5) by the denominator (8) results in a decimal of .625. To convert to a percentage move the decimal two places to the right resulting in 62.5. 62.5 percent is the fraction 5/8 expressed as a percentage.