what are the common multiples of 7 and 11 between 1 and 100
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.
Just 77.
Just 77.
Just 77
Just 77.
77
The common multiples of 1 and 100 are any multiple of 100.
The only one is 77.
The multiples of 11 in that range are 11, 22, 33, 44, 55, 66, 77, 88, 99. For them to be common, they would have to be compared to another set of multiples.
77 is the only common multiple of 7 and 77 between 1 and 100.
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.