The Least Common Multiple (LCM) for 18 42 is 126.
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126 is the Lowest Common Multiple of 18 and 42
lowest common multiple of 6 and 42 = 42
The lowest common denominator of 30 and 42 is 210.
One way to find a common multiple of any group of numbers is to multiply them all (to find the product). So one common multiple of 42 and 60 is 42x60=2520 This will not however, always give the LOWEST common multiple, which in this case is 420.
The lowest common multiple (LCM) of 42 and 70 is 210.