Example: 30 and 42
Factor them.
2 x 3 x 5 = 30
2 x 3 x 7 = 42
Combine the factors, eliminating duplicates.
2 x 3 x 5 x 7 = 210, the LCM
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The LCM of the number 6 and 10 would be 2. This is taught in math.
LCM is an abbreviation for "least common multiple."
Lowest Common Multiple I Think (I) .
Least Common Multiple
When you want to add or subtract unlike fractions.