do you mean from a fraction to a decimal?
improper fractions can be changed into mixed numbers... 40/11 = 3 7/11
but proper fractions can only be changed to decimals... 11/40 = .275
this is because the proper fraction has no whole number value. the numerator is smaller than the denominator causing it to always be less than "1" so when dividing there is only a percentage of "1" and not a whole number with a remainder.
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Mixed fractions can't become proper fractions. Mixed fractions are greater than one.
For addition, subtraction, division and multiplication with other fractions
It is impossible to write a proper fraction as a mixed number because proper fractions are less than 1, and mixed numbers are greater than 1.
You do the numerator divided by the denominator, then simplify the fractions if you can. (this is how you change a improper fraction to a mixed number, you cannot change a proper fraction to a mixed number)
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.