If those numbers are both denominators, the LCD is 304.
If that's 1/6 and 1/9, the LCD is 18.
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The least common multiple of 16 and 19 is their product, 304. The numbers are co-prime, i.e. have no common factor, so the LCM is their product.
The least common factor of any set of numbers is 1.
The LCM of 19 and 38 is 38
1 is, because 19 is prime
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