Any multiple of 28.
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4, 8, 12 and so on. 7, 14, 21 and so on. Common multiples include 28, 56, 84 and so on.
77 is the only common multiple of 7 and 77 between 1 and 100.
The common multiples of 7, 8, and 8 are the infinite set that includes any multiple of 56. The common multiples are thus 56, 112, 168, 224, 280, and so on.
All nonzero numbers have an infinite number of multiples.
the first three common multiples of 7, 20, and 35 are 140, 280, and 420