Write out your starting fraction. As an example, take 1/3.
Multiply or divide the numerator -- or top number -- of the fraction by a number. For this example, multiply 1 by 4 to get 4. Write the result beside the numerator of the starting fraction.
Multiply or divide the denominator -- or bottom number -- of the fraction by the same number. In this example, multiply 3 x 4 to get 12. Write the result beside the denominator of the starting fraction.
Draw a line separating the numerator from the denominator of the equivalent fraction. In this example, the equivalent fraction is 4/12.