The same way as with a positive denominator. The difference is, you change the sign of the numerator.
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when you divide the numerator and denominator by the same factor
you need to divide the denominator too.
simply divide the numerator and denominator by two. if they are not even, find another multiple that fits both the numerator and denominator. once you have simplified the fraction, just turn the denominator into 100 (make sure you multiply or divide only) then multiply or divide the same number by the numerator, then you divide it by 100 and you get your answer!!!!!
You divide the numerator of the ratio by its denominator.
Multiply top and bottom by -1.