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Yes. We can consider -13/3 as an improper fraction.

An improper fraction is a fraction which has a numerator that is greater than its denominator.

numerator is the number above the line, while the denominator is below the line. 

The negative sign in the above fraction is not considered in determining if the fraction is improper or not. -13/3 can be seen as -1 * 13/3 where 13 is greater than 3.