Common denominators

What is the lowest common denominator?

 $\frac{3}{4}+\frac{5}{8}$  

What is the common denominator?

 $\frac{8}{9}+\frac{2}{3}$  

What is the common denominator?

 $\frac{2}{5}+\frac{7}{15}$  

What is the common denominator?

 $\frac{3}{4}+\frac{5}{12}$  

What is the common denominator?

 $\frac{3}{7}+\frac{2}{5}$  

What is the common denominator?

 $\frac{1}{3}+\frac{2}{11}$  

What is the common denominator?

 $\frac{1}{8}+\frac{2}{3}$  

What is the common denominator?

 $\frac{4}{5}+\frac{2}{9}$  

What is the common denominator?

 $\frac{4}{15}+\frac{2}{9}$  

What is the common denominator?

 $\frac{5}{8}+\frac{1}{6}$