An improper number is when the numerator is larger than the denominator which is named a improper fraction.
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That depends on what kind of number name you are given: an improper fraction? A decimal? A percentage? ...
It is a negative mixed fraction or improper fraction, a rational number, a real number.
You do not do anything. An improper fraction IS a real number.
Some numbers are improper fractions and some are not. For example, 1/2 or 0.5 is a number but not an improper fraction. And there is no way in which you can express it as an improper fraction.
If you are using the same number, then the improper fraction and mixed number are equal.