14 = 2 X 7
42 = 2 X 3 X 7
So 2 & 7 are common to both multiples /
NB '3' is NOT a common multiple.
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42 and 84
The least common multiple (LCM) of two numbers is the smallest positive rational number (not zero) that is a multiple of both. Multiples of 14 are: 14, 28, 42, 56, etc. Multiples of 21 are: 21, 42, 63,etc. The least common multiple of 14 and21 is the smallest one of those: 42
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
14, 28 , 42 ... infinity