Mary Jane has \(\frac{3}{8}\) of a medium pizza left. Hector has \(\frac{2}{8}\) of another medium pizza left. How much pizza do they have altogether?

Jeannie ate \(\frac{1}{4}\) of an apple. Kelly ate \(\frac{2}{4}\) of the apple. How much did they eat in all?

Karen is making 14 different kinds of greeting cards. She is making 12 of each kind. How many greeting cards is she making?

Jefferson works part time and earns $1,520 in four weeks. How much does he earn each week?

By installing efficient water fixtures, the average American can reduce water use to about 45 gallons of water per day. Using such water fixtures, about how many gallons of water would the average American use in December?

Collin is making a bulletin board and note center. He is using square cork tiles and square dry-erase tiles. One of every 3 squares will be a cork square. If he uses 12 squares for the center, how many will be cork squares?