The product of a number and its reciprocal is one. A reciprocal is, quite simply, the opposite of the number.
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1/8
The reciprocal of 1/2 is 2/1 = 2
you do that if you need to divide fractions, its called using the recipical.
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.