7 & 11 have no common factor: both are prime.
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No. To multiple fractions multiple the numerators together and multiply the denominators together and simplify (by dividing both numerator and denominator of the result by common factors until the only common factor is 1). The denominators only need to be the same when adding or subtracting fractions.
Keep dividing the numerator and denominator by any common factor they have, until they have no common factor except ' 1 '.
By looking for common factors - factors that appear in both numbers - and dividing both numbers by the same factor.
You can't simplify that. There are no common factors.You can't simplify that. There are no common factors.You can't simplify that. There are no common factors.You can't simplify that. There are no common factors.
You don't need a common denominator to divide fractions.