<u>An improper fraction is when the numerator is a larger number than the denominator.</u> An improper fraction is also what the fraction is before you simplify it down to either a whole number or a mixed number.
An example of an improper fraction simplified to a whole number is 25/5. This can be simplified down to 5.
An example of an improper fraction simplified to a mixed number is 17/3. This can be simplified down to 5-2/3.