252
LCD(63, 7) = 63.
LCD(9, 28) = 252
LCD(9, 21) = 63
LCD(28, 52) = 364
126
63
It is: 315
The answer is 1
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.
The LCD (Lowest Common Denominator) of 7 and 9 is 63.
It is: 63