The factors of 56 are: 1, 2, 4, 7, 8, 14, 28, 56
The factors of 72 are: 1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36, 72
The factors of 90 are: 1, 2, 3, 5, 6, 9, 10, 15, 18, 30, 45, 90
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The lowest common multiple is 18. The first four common multiples are thus the first four multiples of 18 and are: 18, 36, 54 and 72.
Since 18 is a factor of 72, all of its factors are common.
The common factors are: 1, 3, 9
The factors of 35 are 1, 5, 7, and 35 The factors of 55 are 1, 5, 11, and 55 The common factors of 35 and 72 are 1 and 5
The common factors are: 1, 2, 3, 6.