not necessarily no not unless the prompt ask you too then i suggest you shouldn't it is quite simple to do without and in my opinion MUCH easier.
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For addition, subtraction, division and multiplication with other fractions
Change each mixed fraction to an improper fraction. Do this by multiplying the denominator by the whole number next to the fraction and then adding the numerator to the product you get. Once you do this, multiply fractions normally.
You cannot.
improper fraction
improper fraction