1, 2, 4, 5, 10, 11, 20, 22, 44, 55, 110, 220.
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The greatest common factor of 220, 440, and 880 is 220
1 x 880, 2 x 440, 4 x 220, 5 x 176, 8 x 110, 10 x 88, 11 x 80, 16 x 55, 20 x 44, 22 x 40 = 880
88, 176, 264, 352, 440, 528, 616, 704, 792, 880, 968 . . .
The LCM is: 220
The least common multiple of 20,11 is 220.