126
LCD(18, 21) = 126
LCD(9, 3) = 9
The LCD of 20 and 9 is 180.
LCD(9, 15) = 45
LCD(9, 36) = 36.
lcd(9, 6) = 18.
If you mean lcm, it is 36 because 9 x 4 equals 36 and 3 x 12 equals 36.
LCD(21, 13, 14, 15) = 2730
the LCD of 2, 9 and 5 = 90
21
9 = 3^2 15 = 3 x 5 21 = 3 x 7 lcm = 3^2 x 5 x 7 = 315