For 49 and 17, 833
For 4/9 and 1/7, 63
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what is the common denominator of 49 and 9
LCD(49, 72) = 3528
At least one other fraction is needed to determine a common denominator.
1360
The LCD for 49 and 343 is 49. You divide these two number by 49 you get 1 and 7.