The LCD of 28 and 312 is 2184
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532
Since 11 is a prime number and does not evenly go into 28 or 2, then the least and only common denominator is 1.
The least common multiple of 28 and 76 is 532
The least common multiple of 72120 , 28 = 504,840
Least Common Multiple (LCM) for 28 23 is 644