lowest common denominator of 4/5 and 7/15 would be 15
4/5=12/15
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Assuming you mean the LCM (Least Common Denominator of 2 fractions is the LCM of the denominators, which for 7/1 and 16/1 is 1), the answer is 112.
If 16 and 19 are denominators, their LCD is 304. If that's 1/6 and 1/9, the LCD is 18.
To reduce a fraction to its lowest terms divide the numerator and the denominator by their highest common factor as for example 12/16 = 3/4
720
The lowest common factor of any set of integers is 1.