When you want to add or subtract unlike fractions.
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LCM is an abbreviation for "least common multiple."
The LCM of the number 6 and 10 would be 2. This is taught in math.
Lowest Common Multiple I Think (I) .
Least Common Multiple
GCF - Greatest Common Factor (GCF is always smaller or equal to at least one of the numbers) LCM - Least Common Multiple (LCM is always greater or equal to at least one of the numbers)