If its not an improper fraction then you cant....
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)
You change the mixed number into an inproper fraction.
210 is not a fraction or a mixed number. It is a whole number.
One can change a decimal into a fraction or mixed number and simplified by expressing it to the number of tens.
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 change the mixed number to an improper fraction, multiply its denominator by the whole number. Then, if required, convert back to a mixed fraction.
Change the mixed number into a fraction or a decimal and multiply it by 100 for its percentage value
I don't think you can but, you can change an improper fraction to a decimal.
24.4 = 244/10 = 122/5 (fraction) = 242/5 (mixed number).
Convert the mixed number to an improper fraction. Convert the whole number to a fraction with a common denominator. Proceed with the subtraction.