75
LCD of 75 and 60 is 1500.
5
525
gcf of 45 and 75 is 15.
LCD(75, 275) = 825
300
The LCD is 600. Since the pair have no common prime factors, the LCD is the product of the two. 8 x 75 = 600
LCD (lowest common denominator) refers to fractions and your question did not include any fractions. However, assuming that you're looking to reduce 75/275, the answer is 3/11.
12 is the LCD for 3 and 4.
LCD(8, 3) = 24.
LCD(2, 3) = 6.
LCD(9, 3) = 9