21, 24, 27, 30, 33, 36, 39.
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the multiples of 20 are 20,40,60,80,100,120,140,160,180,200,220,240,260,280,300,320,340,360,380,400,420,440,460,480,500 and so on. Just keep adding 20!20, 40, 60 and so on.The multiples start with 20. And then 20 is added to every preceding number.For example, 1x20=20.The next multiple would by 20+20= 40. Similarly, the next would 40+20 (Adding 20 to the preceding number- the preceding number would be the second multiple in this case).Thus the multiples will be 20,40,60,80,100,120 and so on. You can't determine all the multiples as the greatest number is unknown.
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.
All numbers that are multiples of all 2, 8 & 10 are multiples of their lowest common multiple which is 40.The multiples of 40 are 40, 80, 120, 160, ... of which only 80 is between 61 and 107.
The integral multiples are 5, 10, 15, 20, 25, 30, 35, 40, and 45.