140, 280, 420, 560, 700
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7, 14, 21, 28, 35
Since the lowest common multiple of 6 and 7 is 42, the multiples of 6 and 7 are multiples of 42. The first five are: 42 84 126 168 210
The first four multiples of five: 5, 10, 15, 20
The first 10 multiples of 5 are: 5, 10, 15, 20, 25, 30, 35, 40, 45, and 50.The first 10 multiples of 7 are: 7, 14, 21, 28, 35, 42, 49, 56, 63, and 70.
The first five common multiples of seven and twenty are: 140, 280, 420, 560, 700.