Add the letter "n" after the first article. That is, change "a" to "an".
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No.
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.
You change them into improper or topheavy fractions.
First you would want to change the mixed number to an improper fraction. Then you can subtract
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