I don't have a list of choices in front of me, so I can't tell you what numbers are not factors of 810. I can, however, list the factors of 810 for you. They are: 1, 2, 3, 5, 6, 9, 10, 15, 18, 27, 30, 45, 54, 81, 90, 135, 162, 270, 405, and 810.
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The greatest common factor of 100 , 810 = 10
1 to 5
810, 1620, 2430, 3240, 4050 +810 . . .
The least common multiple of the numbers 54, 81 and 135 is 810.
No, that's just a factor. A common factor is when that factor is also a factor of another number.