just multiply across. (numerator x numeraotor= new mumerator, denomonator x denominator= new denominator) then simplify if necessary
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unlike denominators: the bottom number of a fraction. to have unlike denominators you must have two fractions with a different number on the bottom of each fraction.
Mix numbers
To multiply two fractions, multiply the numerators together, then the denominators, then put the new numerator over the new denominator. Simplify if you can. To divide fractions, invert the second fraction and multiply as just described.
If we are given two fraction, with two same denominators, we can just say which is bigger by comparing the numerators. But, if the denominators are different, say a/b and p/q, then compare, a*q and p*b.
You can multiply the two denominators, or you can find the least common multiple for the two denominators.