The least common denominator is 14. Whenever there are two values, and one is a multiple of the other, the multiple (larger number) is the LCD.
The LCD of 6 and 7 is 42
14
LCD is 24
It is: 28
It is: 70
49 x 2 = 98 14 x 7 = 98 98 is the LCD
LCD(6, 14) = 42
42
The LCD of 6, 5, and 7 is 210.
The LCD of 1/4 and 1/6 is 12
126