72
LCD(9, 36) = 36.
LCD(44, 36) = 396
LCD(12, 9) = 36
If you mean lcm, it is 36 because 9 x 4 equals 36 and 3 x 12 equals 36.
The lowest common multiple is 5832 which would be used for the LCD. 729 is 36 and 8 is 23. Since they have no common factors, you find the LCD by multiplying the two numbers.
72
180
36
144
LCD(4, 2, 9) = 36
63...so it would be 56/63 and 36/63
LCD(6, 8) = 24