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Q: What are the common multiples of 13 and 81?

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52 = 4 x 13 = 22 x 1381 = 9 x 9 = 34Since 52 and 81 do not have any common prime factor, then 52 x 81 = 4,212 is their LCM. So that the other multiples they have in common are all the multiples of 4,212.

81, 162, 243 and so on.

Multiples of 27 include 27, 54 and 81. For them to be common, they need to be compared to another set of multiples.

The LCM is 891.

Multiples of 13 include 13, 26, 39 and so on. For them to be common, they need to be compared to another set of multiples.

Common multiples include any multiple of 405.

multiples of 9

The common multiples of 6 and 13 are the infinite set of multiples of their LCM, which is 78. So the common multiples of 6 and 13 are 78, 156, 234, 312, 390, and so on.

They are all multiples of 9. Their common multiples are 405, 810, 1215 and so on.

1, 9, and 81 are the only multiples of 81

The least common multiples of 5, 11, and 13 is 715.

Common multiples include 405, 810 and 1215

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