The LCM of 15 and 20 is 60, which is the multiple of the combined prime factors of both numbers (2 2 x 3 x 5).
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The Least Common Multiple (LCM) of (20,35) is 140.
least common multiple
the least common multiple, or LCM
least common multiple, or LCM.
Least common multiple is abbreviated as LCM.