5
LCD of 75 and 60 is 1500.
75
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
The GCF is 27.
Find lcd for both fractions = 300, so (4/300) / (75/300), divide numerators = 4/75
31 and 47 are prime, the rest composite.
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.
LCD (Least Common Divisor) is not a normal term. LCM (Least Common Multiple) is, as well as GCD (Greatest Common Divisor). The LCM of 10 and 25 is 50, while the GCD of 10 and 50 is 10. I suppose if you were really looking for the LCD of 10 and 25, it is 5.