You multiply the whole number part of the mixed number by the denominator and then add that number to the numerator. This new sum is going to be the numerator of your improper fraction, and your old denominator will remain as your denominator. For example, 3 3/2 is equal to (3*2+3)/2 which is 9/2.
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If you are using the same number, then the improper fraction and mixed number are equal.
Improper Fraction.
43 is an integer, not an improper fraction nor a mixed number.
A mixed number can be changed into an improper fraction
First you would want to change the mixed number to an improper fraction. Then you can subtract