A single number cannot have a common denominator. Commonmeans that it refers to two or more numbers.
12 is a common denominator.
The lowest common denominator would be twelve!
Ninths.
The common denominator of 2/3 and 5*6 is 3.
sixths
2/3 and 3/4 Least Common Denominator is 12
15 and two thirds plus four fifths = one two fiftenth
the lowest common denominator (LCD) is 12
You need at least two things to find something in common between them.
12
63
Convert to a common denominator (in this case 12), then do the subtraction.