The multiples of 16 are 16, 32, 48, 64, 80, etc.
The multiples of 20 are 20, 40, 60, 80, 100, etc.
The common multiples of 16 and 20 are 80, 160, 240 and so on.
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Here is one example: 20, 40, 60, 80, 100, 120, 140, 160, 180.
16, 32, 48. Since 16 is divisible by 4. Every multiple of 16 is also a multiple of 4, so I just took the first 3 multiples of 16.
The first five multiples of 4 are 4, 8, 12, 16 and 20. For them to be common, they need to be compared to another set of multiples.
The first 4 multiples of 4 are: 4, 8, 12, and 16.