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In this m odule, you can study how to add and subtract fractions with like denominators, such as 3/4 - 1/4, and also with unlike denominators, such as 1/2 - 1/3.
The six-minute video above reviews the meaning of fractions and then explains fraction addition. (If you want to skip to the review, start the video at 2:30.)
The video above explains how to subtract fractions.
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Study fraction subtraction
Read about fraction subtraction at mathsisfun.com. This site also has a video demonstration of subtraction steps and a quiz at the end.
When you change a denominator (the bottom part) of a fraction, you must also change the numerator (the top part) to keep the fraction worth the same amount.
Practice and study
Use these search terms to find your own resources :
adding fractions unlike denominators subtracting fractions unlike denominators