$\frac{7}{9}+\frac{2}{3}=\frac{7}{9}+\frac{6}{9}=\frac{13}{9}=1\frac{4}{9}$  

 

$\frac{5}{8}+\frac{7}{10}=\frac{25}{40}+\frac{28}{40}=\frac{53}{40}=1\frac{13}{40}$ $\frac{5}{8}+\frac{7}{10}=\frac{25}{40}+\frac{28}{40}=\frac{53}{40}=1\frac{13}{40}$  

 

$\frac{9}{11}+\frac{3}{4}=\frac{36}{44}+\frac{33}{44}=$   $\frac{69}{44}=$   $1\frac{25}{44}$  

 

$\frac{23}{24}+\frac{7}{12}=$   $\frac{23}{24}+\frac{14}{24}=$   $\frac{37}{24}=1\frac{13}{24}$  

 

$\frac{13}{20}+\frac{11}{12}=$   $\frac{39}{60}+\frac{55}{60}=$   $\frac{94}{60}=1\frac{34}{60}=1\frac{17}{30}$