There is an infinite number of common multiples for 13 and 17. A common multiple of any two or more numbers is any number into which each of two or more numbers can be divided evenly (zero remainder). However, the least or lowest common multiple (LCM) of 13 and 17 is 221.
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the common multiples are most all of the multiples of 8
All multiples of 840 are common multiples of 60 and 280
Common multiples of 9 and 10 are all of the multiples of 90.
There are infinitely many common multiples of 6 and 8. The least common multiple of them is 24. After that, all of the multiples of 24 (i.e., 48, 72, 96, etc.) are the common multiples of 6 and 8.
The common multiples of 11 and 4 are 88, and 4.