The LCM of 11 and 12 is 132
132
132
Multiples of 11 and 12 include 132, 264 and 396. For them to be common, they need to be compared to another set of multiples.
Any multiple of 132
Any multiple of 132.
132, 264, 396
132, 264, 396
Any multiple of 264.
132, 264, 396
They are: 132, 264 and 396
132, 264, 396