You need at least two numbers to find something in common.
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LCD(13, 16) = 208
26
If that's 5/12, 10/13 and 7/9, the LCD is 468.
If 13 and 518 are both denominators, the LCD is 6734 If that's 1/3 and 5/18, the LCD is 18 and you can change 1/3 to 6/18
The least common denominator (LCD) is 1.