528
The least common denominator for 12 and 16 is 48.
A common denominator, though the least, is 48.
The least common multiple of 22 , 48 = 528
336
48
48
1200
48
There is none because the Least Common Denominator (or LCD) is the Least Common Multiple (LCM) of the denominators of two or more fractions.
48
48
48