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!
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what is the common denominator of 49 and 9
At least one other fraction is needed to determine a common denominator.
LCD(49, 72) = 3528
The LCD for 49 and 343 is 49. You divide these two number by 49 you get 1 and 7.
The least common denominator of 7 and 49 is 49. You can find this by realizing that 7 goes into 49 without any remainder. This means that anything that is divisible by 49 without a remainder is divisible by 7 without any remainder. So since we want the least common denominator of 7 and 49, we just have 49, 49/49=1 and 49/7=7.