198
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since 9 and 11 have no common factors, the LCD is 99
It is not possible to give a sensible answer to this question. The least common denominator (LCD) refers to a multiple that is COMMON to two or more numbers. You have only one number in the question!
11
99:33,3,99,1. 100:100,1,2,50,25,4,5,20.
LCD means lowest (or least) common denominator, and that implies there must be at least two fractions involved for something to be common to both of them. There is, therefore, no sensible answer to this question.