Exactly the same as you do when multiplying fractions with different denominators.
-- Multiply numerators . . . the product is the numeratore of the answer.
-- Multiply denominators . . . the product is the denominator of the answer.
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To compare two fractions, convert them to a common denominator.To compare two fractions, convert them to a common denominator.To compare two fractions, convert them to a common denominator.To compare two fractions, convert them to a common denominator.
You DO need a common denominator to add, subtract, or compare fractions. You DO NOT need a common denominator to multiply or divide fractions.
Addition or subtraction of fractions require "like" fractions: that is, fractions with the same denominator.
Find the lowest common multiple of the denominators and adjust the fractions accordingly
like, common denominator