12. You need all the factors in each number to get least common multiple, 20 the two needs a 3 and another 2, the 4 needs a three and the twelve has everything it needs.
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Least Common Multiple (LCM) for 9 12 is 36.
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The Least Common Multiple (LCM) for 4 12 18 is 36.Found by factorization:4 = 2²12 = 2² x 318 = 2 x 3²lcm = 2² x 3² = 36
LCM(2, 3, 4) = 12.