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The factors of 9 are 1, 3 and 9. For them to be common, they need to be compared to another set of factors.
The common factors of 27 and 30 are 1, 3, and 9.
1 and 3.
since 9 and 11 have no common factors, the LCD is 99
least common denominator for 15 and 10 is 30, so 9/15 = 18/30 and 7/10 = 21/30