There is none because the Least Common Denominator (or LCD) is the Least Common Multiple (LCM) of the denominators of a pair of fractions.
The common denominator is 28.
You need at least one more fraction in order to have a common denominator.
100
924
The least common denominator is 1. The greatest common denominator is 2. The least common multiple is 1,218.
The common denominator is 28.
A common denominator, though not the least, is 168.
A common denominator, though not the least one, is 14*49 = 686.
A common denominator, though not the least one, is 14*12 = 168.
The least common denominator is 70.
You need at least one more fraction in order to have a common denominator.
Their product.
7.
98
168
126
238