60 I think
A common denominator, though not the least one, is 180.
420
60
LCD(15, 12, 4) = 60.
The least common denominator (LCD) is 1.
the least common multiple of 15,9,and 12 is 180.
There is none because Least Common Denominator (or LCD) refers to the Least Common Multiple (LCM) of the denominators of two or more fractions or mixed numbers. Even if you converted your whole numbers (x) to their fraction equivalents (x/1), the LCD would always be 1.
For 7/12 and 7/15 the LCD is 60.
A common denominator, though not the least, is 150.
The least common denominator is 120.
15
The greatest common denominator is infinite. The least common denominator is 45.