the same way you do when adding. Find a LCM(lowest common multiple) then do what you did to each denominator to the numerators. Example: 1/2 - 1/3. the LCM here for 2 & 3 is 6 so rewrite the problem with how you got 6. 1/2=3/6; 1/3=2/6
The answer then becomes 1/6
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Ensure that the denominators are the same when adding or subtracting fractions.
When adding or subtracting fractions their denominators must be the same
It's the same thing as adding or subtracting normal fractions - just make sure both fractions have the same denominators (by either multiplying the denominators or simplifying the fraction - whichever the question needs).
By the definition of like fractions, the denominators are the same.
Convert them to improper fractions, make sure the denominators are the same and fire away.