Billy ate  $\frac{3}{8}$  of a pizza and Felicity ate  $\frac{1}{4}$  of the pizza. How much pizza did they eat in all?

Which of these numbers could NOT be a common denominator for these two fractions?

 $\frac{1}{2}+\frac{1}{4}=$  

 James is helping his dad paint his house. They mixed $\frac{5}{9}$ gallons of white paint and  $\frac{1}{6}$  gallons of blue pain. How many gallons was the mixture in all? 

 $\frac{1}{4}+\frac{2}{3}$  

 $\frac{5}{12}+\frac{1}{6}$  

 $\frac{1}{3}+\frac{3}{9}\$  in simplest form (you must simplify your answer!)