To get the correct answer. If you look at a problem like 1/3 - 1/4, you might not be able to guess the answer is 1/12 unless you know that 1/3 = 4/12 and 1/4 = 3/12
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You don't need a common denominator to divide fractions.
Yes. You need common denominators if you want to:Add fractionsSubtract fractionsCompare fractions ("which is larger?")You do not need common denominators to multiply or divide fractions. Thus, in the case of fractions, multiplication and division is actually easier than addition and subtraction.
No only when adding or subtracting fractions a common denominator is needed
No.
No, You only need a common denominator when adding or subtracting fractions.