Subtracting Fractions
The steps involved in subtracting fractions are very simlar to adding fractions.

When the fractions you are adding have the same bottom number or denominators, all you have to do is subtract the top numbers or numerators.

Here are some examples:

7/9 - 5/9 = 2/9



8/21 - 1/21 = 7/21 or 1/3




3/4 - 1/4 = 2/4 or 1/2





Now, if the fractions you are subtracting have different denominators, like in adding fractions, you just need to find the least common denominator (LCD).

Here's an example:

1/2 - 1/4 = 2/4 - 1/4



In the above example, the least common denominator is 4. One-half ( 1/2 ) was then converted to its equivalent fraction of two-fourths ( 2/4 ). The equivalent numerator is the result of dividing 4 by the bottom number (2) and then multiplying the result by the top number (1).

Since the fractions now have equal denominators, they can be subtracted easily:

2/4 - 1/4 = 1/4





Here are more examples:

4/5 - 1/3 = 12/15 - 5/15


12/15 - 5/15 = 7/15



3/4 - 3/8 = 6/8 - 3/8


6/8 - 3/8 = 3/8




2/4 - 1/7 = 14/28 - 4/28


14/28 - 4/28 = 10/28 or 5/14




Resource

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