If you have 7/4, you know 1 is equal to 4/4, so 7/4 - 4/4 is 3/4, plus 4/4, (1) is
1 3/4.
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No.
That's a proper fraction. Fractions can be either proper or improper and can't change.
4/9 is a proper fraction and there is not an improper version.4/9 is a proper fraction and there is not an improper version.4/9 is a proper fraction and there is not an improper version.4/9 is a proper fraction and there is not an improper version.
Improper fraction is greater than a proper fraction.
You replace the n by an m: the proper term is "improper fraction".