Just multiply straight through. Numerator times numerator and denominator times denominator.
a/b * c/d
= ac/bd
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When you multiply a fraction by 1, the value does not change. It is like this for any number.
You end up with 1.
The value of the fraction remains unchanged
The numerator changes sign.
Fraction refers to the amount to the right of the decimal point (amounts of less than 1), so if you multiply any (positive) number by a fraction its value will be reduced.