Simply perform the division that the fraction indicates.
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)
First you would want to change the mixed number to an improper fraction. Then you can subtract
If its not an improper fraction then you cant....
You change it into an improper fraction, then simplify it, then if you want to, change it back to a mixed number.
You change them into improper or topheavy fractions.
I don't think you can but, you can change an improper fraction to a decimal.
A mixed number can be converted to an improper fraction.
I wouldconvert both to improper fraction,find a common multiple (CM),calculate equivalent fraction with CM as the denominator,add the numerators,change the improper fraction to a mixed fraction, if required,simplify the fractional part of the mixed fraction - if appropriate and required.
you cant convert a improper into a proper fraction.