9/2 = 4 1/2.
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First you would want to change the mixed number to an improper fraction. Then you can subtract
You change them into improper or topheavy fractions.
I wouldconvert both to improper fraction,find a common multiple (CM),calculate equivalent fraction with CM as the denominator,add the numerators,change the improper fraction to a mixed fraction, if required,simplify the fractional part of the mixed fraction - if appropriate and required.
You don't.
change it to an improper fraction and then divide it