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In order to reduce a fraction, you have to be able to take the same factor out of both numbers. 18 and 5 don't have any factors in common other than 1. You could take 1 out of both of them, but you'd still wind up with 18 and 5. If the GCF of the numerator and the denominator of a fraction is 1, the fraction is in its simplest form.

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10y ago

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