Since both 11 and 13 are prime numbers, the LCM of these 2 number is 11 * 13 = 143.
All multiples of 143 are multiples of 11 and 13 as well
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Multiples of 13 include 13, 26, 39 and so on. For them to be common, they need to be compared to another set of multiples.
The common multiples of 9 and 11 are 99, 198, 297 and so on.
They are: 407 and its multiples
44 and 88 are the only common multiples of 4 and 11 that are less than 100
There is an infinite number of common multiples for 12 and 13, and each is a multiple of the LCM of 12 and 13, which is 156, 312, 468, 624, 780, 936, and so on.