1 x 810, 2 x 405, 3 x 270, 5 x 162, 6 x 135, 9 x 90, 10 x 81, 15 x 54, 18 x 45, 27 x 30 = 810
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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.
The LCM of the given three numbers is 810
The least common multiple of the numbers 54, 81 and 135 is 810.
40,500 810 x 50 = 405 x 100 -------------------------------------------- I suspect that there is a missing slash between the 8 and 10, ie you are asking: What is 8 over 10 of 50? 8/10 × 50 = 40.
810, 1620, 2430, 3240, 4050 +810 . . .