LCD(63, 7) = 63.
63...so it would be 56/63 and 36/63
24
If you mean lcm, it is 36 because 9 x 4 equals 36 and 3 x 12 equals 36.
LCD(9, 21) = 63
It has to be 7x9 or 63 or less. There is no number less than 63 which is divisible by both 7 and 9 therefore 63 is the LCD.
63
126
63
The answer is 1
252
It is: 315