84, 168, 252, 336, 420, 504 . . .
Write the first 6 Multiples of 12 and 14.
The multiples of 2 between 7 and 15 are 8, 10, 12, and 14.
When they get to 336
84, 168, 252
Multiples of 6: 12, 18, 24 Multiples of 7: 14, 21, 28
420 is the LCM
Any multiple of 84
1 and 2 are common factors. 84 and 168 are common multiples.
The Least Common Multiple (LCM) for 10 12 14 is 420.
None of those are multiples of ten.
12, 13, &14
Any multiple of 420.