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You multiply the number by the numerator of the fraction and divide the number so obtained by the denominator of the fraction.

e.g. 6 x 3/2 = 18 / 2 = 9

or you can also divide by denominator first and then multiply by numerator.

6 x 3/2 = 3 x 3 = 9

One and the same thing

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Q: How do you multiply a number and a fraction?
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Why does a number get smaller when you multiply by a proper fraction?

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Why do you end up with a smaller fraction when you multiply a whole number by a fraction?

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