The least common multiple is 210.
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Least Common Multiple (LCM) for 6 30 42 is 210.
The least common multiple of 42 and 126 is 126.
The least common factor of 30 and 42 is the smallest number that is a factor of both of them and is 1.However, I suspect that you mean either:What is the highest common factor of 30 and 42?ie what is the highest number that is a factor of both 30 and 42: hcf = 6;What is the lowest common multiple of 30 and 42?ie that is the smallest number that is a multiple of both 30 and 42 lcm = 210.
The Least Common Multiple (LCM) for 68 42 is 1,428.
The Least Common Multiple (LCM) for 42 86 is 1,806.