[latex]\frac{25}{10}=\frac{25:5}{10:5}=\frac{5}{2}=\frac{4+1}{2}=\frac{4}{2}+\frac{1}{2}=\boxed{2\frac{1}{2}}[/latex]

25/10=5/2=2 1/2. Well let me explain this when you simplify 25/10 it equals 5/2 then you simplify 5/2 it equals 2 1/2.