You could write it as -13/1.
An improper fraction has a numerator larger than the denominator. -13/1 will be your answer.
four and one third as an improper fraction = 13/3
4 1/3 as an improper fraction = 13/3
It is 7/3.
It is 13/9.
5 and 5/13 = 70/13
13 1/2 would be mixed number form, but as an improper fraction it is 27/2.
7 1/3 = 22/3.
1.13 as an improper fraction is 113/100. As a mixed number it is 1 13/100.
If that's 5 and 2/13, the improper fraction is 67/13
It is 13/10 as an improper fraction that can't be simplified further.