Say you have 2 and a half you multiply the whole number by the denominator and then add the number to the numerator. You keep the same denominator as you had before and it comes out as your improper fraction.
If you mean a mixed number to improper fraction, then for example:
3 1/2
You would multiply 2x3 and add 1
2x3+1(denominator times the "big" number plus numerator)
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I don't think you can but, you can change an improper fraction to a decimal.
To change an improper fraction to a proper fraction a person has to find the lowest common denominator. For example, the fraction 3/6 can be broken down to 1/2 by dividing the 6 by the 3 and finding the common denominator to be 2.
Say we had 2 ½, so we would work it out like 4⁄4,+ 4⁄4 + ¼ = 9⁄4. The 9⁄4 is the improper fraction.
32323 is an integer and not a fraction: proper or improper.
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)