When you multiply a fraction by 1, the value does not change. It is like this for any number.
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You end up with 1.
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.
The value of the fraction remains unchanged
The numerator changes sign.
When you multiply a number by 1, it stays the same. When you multiply a number by a number greater than 1, it increases. When you multiply a number by a number that is less than 1 (a proper fraction), it decreases.