The least common denominator (LCD) is 630.
The common denominator of 3 & 9 is 9,as because-3*1=33*2=63*3= 9&.....9*1= 9So here the 9 matches first.
There is none because the Least Common Denominator (or LCD) is the Least Common Multiple (LCM) of the denominators of two or more fractions.
what is a common denominator for 6, 9 and 3
360
36
18
18
126
18
36
It is 630
126
180
The least common denominator for 9 and 10 is 90.
18 3*6 = 18 2*9 = 18
LCD(11, 9, 6) = 198