Cách 1: 2$\frac{3}{4}$ + 5$\frac{7}{9}$
= $\frac{11}{4}$ + $\frac{52}{9}$
= $\frac{99}{36}$ +$\frac{208}{36}$
= $\frac{307}{36}$
= 8$\frac{19}{36}$
Cách 2: 2$\frac{3}{4}$ + 5$\frac{7}{9}$
= 2$\frac{28}{36}$ + 5$\frac{27}{36}$
= $\frac{55}{36}$
= 8$\frac{19}{36}$