5, 10, 15, 20, 25, 30, 35, 40.
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40, 80, 120 +40 . . .
The first common multiple of 5 and 8 is 40 (5x8=40; 8x5=40).
5: 5,10,15,20,25,30,35,40,45,50,55,60,65,70,75,80,85,90,95,100,105,110.10: 10,20,30,40,50,60,70,80,90,100,110,120,130,140,150,160,170,180,190.
The common multiples of 5 and 8 are the multiples of their lowest common multiple; lcm(5, 8) = 40 → the first five common multiples of 5 and 8 are: 40, 80, 120, 160, 200.
The multiples of 4 up to 30 are: 4, 8, 12, 16, 20, 24, 28.