The Least Common Multiple (LCM) for 12 20 is 60.
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The Least Common Multiple (LCM) for 6 12 20 is 60.
A common denominator, though not the least one, is 12*20 = 240.
12 = 2x2x3 20 = 2x2x5 the both have 2x2 in common = 4
Because 60 is the smallest number that both 12 and 20 will divide into evenly.
The Least Common Multiple (LCM) for 5 20 is 20.