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9/5 * 5/9 = 1, because 9*5 is 45 and 5*9 is 45, the problem becomes 45/45, which is 1.

To multiply fractions: # Simplify the fractions if not in lowest terms. # Multiply the numerators of the fractions to get the new numerator. # Multiply the denominators of the fractions to get the new denominator. Simplify the resulting fraction if possible.

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15y ago

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