The least common factor of any set of integers is 1.
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The least common denominator for 9 and 10 is 90.
The factors of 9 are 1, 3 and 9. For them to be common, they need to be compared to another set of factors.
1
since 9 and 11 have no common factors, the LCD is 99
The Least Common Multiple (LCM) for 9 10 12 8 is 360.