The common multiples of 20 and 56 are the multiples of their lowest common multiple, which is 280; there are infinitely many of them and they start:
280, 560, 840, 1120, 1400, 1680, 1960, 2240, 2520, 2800, 3080, 3360, 3640, 3920, 4200, 4480, 4760, 5040, 5320, 5600, 5880, 6160, 6440, 6720, 7000, 7280, 7560, 7840, 8120, 8400, 8680, 8960, 9240, 9520, 9800, 10080, 10360, 10640, 10920, 11200, 11480, 11760, 12040, 12320, 12600, 12880, 13160, 13440, 13720, 14000, 14280, 14560, 14840, 15120, 15400, 15680, 15960, 16240, 16520, 16800, 17080, 17360, 17640, 17920, 18200, 18480, 18760, 19040, 19320, 19600, 19880, 20160, 20440, 20720, 21000, 21280, 21560, 21840, 22120, 22400, 22680, 22960, 23240, 23520, 23800, 24080, 24360, 24640, 24920, 25200, 25480, 25760, 26040, 26320, 26600, 26880, 27160, 27440, 27720, 28000, ...
This cannot be answered because the common multiples of any two or more numbers are infinite.
56
lcm(2, 7) = 14 → first 3 common multiples are: 14, 28, 42; lcm(2, 8) = 8 → first 3 common multiples are: 8, 16, 24; lcm(7, 8) = 56 → first 3 common multiples are: 56, 112, 168; lcm(2, 7, 8) = 56 → first 3 common multiples are: 56, 112, 168.
Because the LCM of 12 and 56 is 168 and 336 is the next common multiple
28, 56
No, 2 and 28 are not multiples of 56, they are factors.
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.
This cannot be answered because the common multiples of any two or more numbers are infinite.
56
56
The multiples of 28 include 28, 56 and 84. For them to be common, they need to be compared to another set of multiples.
1 All the common multiples of 56 and 60 are: 1,2,4
840
56
56
lcm(2, 7) = 14 → first 3 common multiples are: 14, 28, 42; lcm(2, 8) = 8 → first 3 common multiples are: 8, 16, 24; lcm(7, 8) = 56 → first 3 common multiples are: 56, 112, 168; lcm(2, 7, 8) = 56 → first 3 common multiples are: 56, 112, 168.
Common multiples include 1512, 3024, 4536 and so on.