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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.
To be a multiple of 4, 10 and 20 the number must be a multiple of their lowest common multiple. lcm(4, 10, 20) = 20 What is required is a multiple of 20 between 61 and 107. The numbers 80 and 100 both satisfy the problem of being between 61 and 107 and being a multiple of 4, 10 and 20.
The common multiples of a number with itself are the multiples of that number. Thus all multiples of A between 1 and 100 are the common multiples of A and A between 1 and 100.
The Least Common Multiple (LCM) for 100 and 200 is 200.