If that's 8 and 1/8 and 16 and 1/4, the LCD is 8.
If 16 and 19 are denominators, their LCD is 304. If that's 1/6 and 1/9, the LCD is 18.
LCD(9, 16, 18, 81) = 1296
it equals 48
The LCD of 9 and 6 is 18. 8/9 = 16/18 5/6 = 15/18 16 - 15 = 1/18
LCD(20, 6) = 60
The LCD of 4 and 16 would be 4.
LCD(16, 23) = 368
LCD(11, 16) = 176
If those numbers are both denominators, the LCD is 304. If that's 1/6 and 1/9, the LCD is 18.
LCD(18, 21) = 126
The LCD of 16 and 8 is 16, because 8 and 16 are both factors of 16.