the least common multiple is 84
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28 multiples are 7,4,1,2,14,28, 63 multiples are 1.63.3.3.7 greatest is 7
Since the LCM is 12 then the common multiples are multiples of 12 12, 24, 36, 48
The first 3 common multiples of 4 and 12 are: 12, 24, 36
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.
12 and all its multiples.