11, 22, 33, 44, 55, 66, 77, 88, 99, . . .
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Itself because 11 is a prime number.
It is 4/11 0f 12.1 = 4.4
The COMMON multiples of 11 require at least one other number with which the multiple is COMMON. The COMMON multiples will be multiples of 11. The multiples of 11 between 1 and 100 are {11, 22, 33, 44, 55, 66, 77, 88, 99}, thus the COMMON multiples of 11 [with other numbers] wil be one, or more of this set.
11 is a prime number. It's multiples are only 11 and 1. It has only 2 multiples.
The least common multiples of 5, 11, and 13 is 715.