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Using the same principles as multiplying a negative whole number by a positive whole number, where the result would be a negative, the product of a (positive) fraction and a negative whole number would equal the product of the two, with the minus sign included. For example, 1/2 x -4 = -2.

The same rule can be applied the other way around, multiplying a negative fraction by a positive number would produce the same result.

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Q: How do you multiply a fraction by a negative number?
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