280 560 840 1120 1400 1680 1960 2240 2520 2800
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.
All multiples of 840 are common multiples of 60 and 280
40
280, 420, 560
All of the multiples of 280 are. There are an infinite number of them.
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, ...
1680 and its multiples.
They are: 70, 140, 210 and 280
The LCM is: 280
70, 140, 210, 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.
the first three common multiples of 7, 20, and 35 are 140, 280, and 420
140, 280, 420 and so on.