-13 is an integer and not a fraction. However, it can be expressed in rational form as -13/1 or, in the form of an improper fraction as -13 and 0/1. You can then calculate equivalent rational fractions if you multiply both, its numerator and denominator, by any non-zero integer.
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An improper fraction has a numerator larger than the denominator. -13/1 will be your answer.
If that's 5 and 2/13, the improper fraction is 67/13
It is already an improper fraction as 13/4
39/13 is already an improper fraction. Its numerator which is 39 is greater than its denominator, 13.
1.3 as an improper fraction is 13/10.