42, 84, 126, 168, 210
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The first 5 multiples of 21 are: 21, 42, 63, 84, and 105.
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.
42 is the LCM of 3, 6 and 7. All multiples of 42 are multiples of 3, 6 and 7
42, 84.
Just 42.