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If 9, 11, and 16 are all denominators, you could multiply them together to come up with a common denominator of 1,584.
The least common denominator (LCD) is 630.
126
The lowest common denominator of the fractions 2 over 9 and 1 over 6 is 18.
Well, honey, let me break it down for you. To compare fractions, you need to find a common denominator. In this case, the common denominator is 21. So, 11/21 is greater than 9/17. It's as simple as that, darling.