The difference between the fractions a/b and c/d = abs[(ad - bc)/bd]
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Subtract their numerators providing that they both have the same denominators.
When you subtract a fraction from itself. Two equivalent fractions also have a difference of zero.
Because to add or subtract two fractions you first have to find equivalent fractions for both which have the same denominator.
The difference is that they equivalent fractions worksheets have graphics and explain the concepts in easier to understand language. I find them to be an easier and fun way to introduce and explain fractions.
The LCM is used for integers, not fractions. If you're trying to add unlike fractions, take the LCM of the denominators (known in this case as the least common denominator, or LCD), convert the fractions and proceed.