Find the lowest common denominator. Once their denominators are the same, the one with the larger numerator is the largest.
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I assume you mean, with different denominators. If you want to add the fractions, subtract them, or compare them (determine which one is greater), you have to convert them to similar fractions (fractions with the same denominator) first. Converting to similar fractions is not necessary, and usually doesn't even help, if you want to multiply or divide fractions.
No.
Finding the LCM will help you add and subtract fractions. Finding the GCF will help you reduce fractions.
The largest factor of any number is the number itself.
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.