110; 220; 330; 440; 550; 660; 770; 880; 990 and so on.
The least common multiple of 10 and 11 is 110. So every multiple of 110 will also be a common multiple of both 10 and 11 (but just not the least common multiple).
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1 11 10
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.
The least common multiples of 5, 11, and 13 is 715.
what are the common multiples of 7 and 11 between 1 and 100
Each common multiple of 9 and 10 occurs exactly once (in the list of common multiples), so there is no common multiple that occurs the most. All common multiples of 9 and 10 are the multiples of their least common multiple which is 90.