When adding or subtracting fractions with different denominators their lowest common denominator must be found first by using the LCM of their denominators
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Finding the LCM will make adding and subtracting fractions easier.
Anything having to do with adding or subtracting unlike fractions.
The LCD of two fractions is the same as the LCM of their denominators.
Finding the GCF will help in simplifying fractions. Finding the LCM will help in adding and subtracting fractions.
Possible reasons: To add or subtract fractions, To compare fractions with different denominators.