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The first 5 multiples of 5 are: 5, 10, 15, 20 and 25.5, 10, 15, 20, 25
The first 5 multiples of 4 are 4, 8, 12, 16, then 20.
Assuming positive multiples, 5, 10, 15, 20, 25, 30
300, 600, 900
60, 120 and 180