80, 160, 240, 320, 400
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56, 72, 80
Here is one example: 20, 40, 60, 80, 100, 120, 140, 160, 180.
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.
20, 40, 60, 80, 100, 120, 140, 160, 180, 200.
What are the first three common multiples of four and five