800, 1600, 2400, 3200, 4000, 4800, 5600, 6400, 7200, 8000, 8800, 9600, 10400, 11200, 12000.
The first five multiples of 5 are 5, 10, 15, 20 and 25. For them to be common, they need to be compared to another set of multiples.
Multiples of 800
The first five multiples are: 11 22 33 44 and 55
The first 15 multiples of 160: 160, 320, 480, 640, 800, 960, 1120, 1280, 1440, 1600, 1760, 1920, 2080, 2240, 2400 . . . ∞
400 800 1200 multiples of 4
They are: 4 8 12 and 16
800, 1600, 2400, 3200, 4000, 4800, 5600, . . .
multiples of 11 11,22,33,44,55,,66,77,88,99 multiples of 15 15,30,45,60,75,90
multiples of 400: 400, 800, 1200, 1600, 2000, 2400, ...
Multiples of 15 include 15, 30 and 45. For them to be common, they need to be compared to another set of multiples.
7, 14, 21, 28, 35
They are: 8, 16, 24, 32 and 40