288, 296, 304, 312,...
All common multiples of 7, 10 and 8 are divisible by them. The lowest common multiple of them is 280, so all multiples of 280 are divisible by them, namely 280, 560, 840, 1120, ...
81624324048566472808896104112120128136144152160168176184192200208216224232240248256264272280 .......................
Any multiple of 280.
All multiples of 840 are common multiples of 60 and 280
280 divided by 8 is 35
It isn't. 280/8 = 35
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.
35, 70, 105, 140, 175, 210, 245, 280.
280
280/315 = 56/63 = 8/9
5 over 8
3 over 8