18
it is 1
LCD(9, 3) = 9
If that's 9/10 and 2/3, the LCD is 30.
the LCD of 2, 9 and 5 = 90
LCD(7, 9, 2) = 126.
LCD(2, 9, 11) = 198.
LCD(4, 2, 9) = 36
36
The smallest multiple 3 and 9 have in common is 9. 2/3 becomes 6/9 and 5/9 does not change
9
9 multiplied by 14 is 126. So believe it or not the LCD of 2/9 and 3/14 is 126.
LCD(2, 3) = 6.