You need at least two numbers to find something in common.
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.
LCD(13, 16) = 208
LCD(7,9,13) = 7*9*13 which is 819
The LCD of 13, 14 and 15 is 2730 The LCD of 1/3, 1/4 and 1/5 is 60
LCD(21, 13, 14, 15) = 2730
The least common divisor (LCD) of 8 and 13 is 104.
Since 13 is prime and 18=2*3*3, the LCD would be 2*3*3*13, or 234
78
143
195
2431
It is 572
156