An improper fraction is a fraction whose absolute value if greater than or equal to 1. Thus an improper fraction, with a positive denominator, has a numerator whose absolute value is greater than the denominator.
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An Improper Fraction has a top number larger than (or equal to) the bottom number.
Improper.
You cannot. By definition, an improper fraction has an absolute value which is greater than 1 whereas a regular fraction has a value less than 1.
When the top number (the numerator) of a fraction is greater than the bottom number (the denominator) then this is said to be an improper fraction. The formal definition is that an improper fraction occurs when the absolute value of the numerator is greater than or equal to the absolute value of the denominator.
It is a vulgar or 'top heavy' fraction
An improper fraction is 'top-heavy' - for example 12/5 or 21/16