77 is the only one. 7 and 11 are both prime numbers, which means they must also be relatively prime (no common factors) so their least common multiple is 77.
http://wiki.answers.com/Q/What_are_all_the_common_...

I concur with 44 and 88. FWIW.....I think the methodology is as follows, use 4*11=44 as a starting point since they have no common factors, and then use all multiples of this number
http://answers.yahoo.com/question/index?qid=200909...

The multiples of 7 under 100 are :7, 14, 21, 28, 35, 42, 49, 56, 63, 70, 77, 84, 91, 98. the multiples of 11 under 100 are :11, 22, 33, 44, 55, 66, 77, 88, 99.
http://wiki.answers.com/Q/What_is_all_the_multiple...

Common Multiples require two numbers. I believe you just meant to write multiples. A multiple of 7 can be written as follows: Let n be any positive integer. 7n = multiples of 7. 7
http://wiki.answers.com/Q/What_are_all_common_mult...
