Answer :

[tex]5\frac{3}{4}+2\frac{1}{2}=5\frac{3}{4}+2\frac{2}{4}=7\frac{5}{4}=8\frac{1}{4}\\\\mistake:\\\\5\frac{3}{4}+2\frac{1}{2}=5\frac{3}{4}+2\frac{1}{4}=5+2+\frac{3+1}{4+4}=7\frac{4}{8}=7\frac{1}{2}[/tex]
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