The fraction reduces to 1 - UNLESS they are both zero, in which case the fraction is undefined.
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Numerator, Denominator or Denominator, Numerator.
The fraction gets smaller or increases, depending on whether the numerator and denominator are positive or negative.
Nothing, there is no change, since you are multiplying by 9/9 = 1.
Yes because the numerator will not be right if the denominator doesn't have the same as the other denominator which will mess up the answer
It is then an improper or 'top heavy' fraction