280 560 840 1120 1400 1680 1960 2240 2520 2800
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All multiples of 840 are common multiples of 60 and 280
Not all multiples of 40 are multiples of 80. Only the even multiples of 40 are also multiples of 80. The odd multiples, e.g. 40, 120, 200, 280, and 360, are not multiples of 80.
81624324048566472808896104112120128136144152160168176184192200208216224232240248256264272280 .......................
The first 10 multiples of 70: 70, 140, 210, 280, 350, 420, 490, 560, 630, 700
300.Here's an easy way to work it out, you get all multiples of 10 that are in between 280 and 320: 290, 300, 310. then, you simply find the middle number by crossing out the outer numbers, you are left with 300.