let say for example you have 7 fifths. There are 5 fifths in a whole. You still have two fifths remaining and therefore the fraction becomes 1 and 2 fifths (1 2/5).
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You change the mixed number into an inproper fraction.
change the mixed # into a fraction
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You don't.
You change the mixed number to an improper fraction, multiply its denominator by the whole number. Then, if required, convert back to a mixed fraction.