A product is a binary operator. That means a product is the result of combining TWO numbers. You cannot have a product of just one number - whether it is a fraction or not is irrelevant.
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We call that cross multiplying.
Just multiply the numerator by the whole number, and keep the same denominator. After you do that, chances are that you'll have to simplify the fraction to a mixed number.
The only generalisation posible is that it will always be a rational number. The product can be positive or negative; it can be a fraction or an integer, it can be larger or smaller.
You flip it to a fraction
The product of -1 and -1 is 1. The reciprocal of a fraction is called its reciprocal.