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All you need to do to multiply two fractions is multiply the numerators, and multiply the denominators. First converting to a common denominator is possible, and it will indeed give you a correct answer, but it's an unnecessary complication. Not only must you find this common denominator, but it would also cost you additional work to simplify the result.

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9y ago

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First answer: Why do you think it should be needed ?

Second answer: Perhaps it can be best explained by means of a parable.

You can easily take 1/4 of a cake, but you can't add (1/4) + (1 cake).
In order to add, either they must both be quarters, or else they must both be cakes.

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9y ago
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Q: Why isn't a common denominator needed when multiplying or dividing fractions?
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