LCD(7, 9, 2) = 126.
14
70
It is: 42
70
The LCD for 2 and 7 is 14
LCD(40, 50) = 200
7 and 100 only have the common factor of 1, so the LCM or LCD (least common denominator) for fractions having 7 & 100 for denominators is 7*100 = 700.
63
560
LCD(8, 100) = 200
LCD of 60 and 100 is 300.