Twelve subtraction problems a sheet, mixing shared and different denominators. The generator orders each pair so the larger fraction comes first, which means no answer is ever negative - students at this stage are not expected to handle that, and a stray negative derails a sheet.
Problems where both fractions are equal are dropped rather than printed, since an answer of zero practises nothing. Set Denominators to Unlike Denominators when finding a common denominator is the skill you are after.
The same way you add them: rewrite both over a common denominator, subtract the numerators, then reduce.
In lowest terms, and as a mixed number rather than an improper fraction - so 6/4 is given as 1 1/2 and 8/4 as 2. Turn on Include Answer Pages to print the key behind the sheet.
No. Each pair is ordered so the larger fraction is on the left, and identical pairs are skipped.
Yes - the Adding Fractions page, and a dedicated page for unlike denominators.