It is: 126 which is also the LCM
LCD(63, 7) = 63.
You need at least two fractions to find a common denominator.
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
The LCD (Lowest Common Denominator) of 7 and 9 is 63.
The LCD of any set of numbers is always 1.