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.
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Multiples of 12 are 12, 24, 36, 48, 60, 72, 84... Multiples of 42 are 42, 84... Two common multiples of 12 and 42 are 84 and 168. The Least Common Multiple of 12 and 42 is 84.
Just 42.
42 is the LCM of 3, 6 and 7. All multiples of 42 are multiples of 3, 6 and 7
It is: 60
42 and 84