Because if you divide out the fraction you get a number bigger than one. (Definition of an improper fraction).
When you convert a decimal greater than 1 into a fraction its easier to change it into a mixed number first. Then change it into an improper fraction.
Proper fractions are less than 1. Improper fractions are greater than 1. For a proper fraction to become an improper fraction, you would have to add a quantity that would make it greater than 1.
It remains an improper fraction.
Improper fractions can't become proper fractions.
4/6 is a proper fraction. Proper fractions can't become improper fractions.
5/8, a proper fraction, cannot become an improper fraction. It is, however, in its simplest form.
Any whole number can become an improper fraction by putting it over one. 9 = 9/1
4/5 is a proper fraction. Proper fractions can't become improper fractions; it wouldn't be proper.
8/13 is a proper fraction. Proper fractions can't become improper.
When the numerator is equal to or a multiple of the denominator.
2.1 = 2 + 1/10 = 2 1/10 It can also be written as the improper fraction 21/10
An IMPROPER FRaction can be converted to a mixed number/fraction. Here is an example 14/3 Divide the '3' into '14' . It will go '4 ' times with a remainder of '2'. So the '4' becomes the coefficient (big) number and the '2' is placed over the '3' to make a faction. So 14/3 = 4 2/3 Mixed number/fraction.