630, 1260, 1890, 2520, 3150, 3780 +630 . . .
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Multiples of 6 must also be multiples of 1, 2 and 3.
The first 6 multiples of 1 are: 1, 2, 3, 4, 5, and 6.
What are 2 multiples that 3 and 5 have in common
Multiples of 30 from 120 to 990
The prime factors of 6 are 2 and 3. The prime factors of 9 are 3 and 3. Therefore, in order to form a multiple of both, we must have one 2 and two 3's which is 2*3*3=18. To find the next common multiples, we multiply 18 by 2, 3, 4, 5, and 6 to get 36, 54, 72, 90, 108.