8/9, 5/12, 6/7
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There is none because the Least Common Denominator (or LCD) is the Least Common Multiple (LCM) of the denominators of a pair of fractions. If those numbers are denominators, the LCD is 15.
You can multiply the two denominators, or you can find the least common multiple for the two denominators.
16 is the answer you're looking for. If you have two fractions with denominators of 8 & 16, then 16 is the Least Common Multiple of the two denominators.
When you're adding or subtracting fractions with different denominators, if you multiply the denominators that's your Quick Common Denominator. I'ts useful for denominators that don't have a low Least Common Factor.
The least common denominator is 144.