The product of a number and its reciprocal is always 1 - by definition.
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The reciprocal of a number is 1 divided by that number. A number multiplied by its reciprocal is equal to 1. In the case of a fraction, to get the reciprocal, simply exchange numerator and denominator. Thus, the reciprocal of 5/3 is 3/5.
The reciprocal property of multiplication says that (a/b) times (b/a) equals 1.
A product that results in a negative number such as multiplication of a positive number with a negative number resulting in a negative number, a negative product.
A multiple of a number is the product of that number and any whole number.
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