1. Mark invites 5 friends to his birthday party. He gives 9 balloons to each friend. How many balloons did he distribute?   2. There are 4 cakes. Each cake is cut into 5 pieces. How many pieces are there in all?   3. There are 7 sandwiches arranged in a tray. How many sandwiches are there in 5 trays?   4. Dad has planned 4 games for the party. Each game would have 3 winners. How many prizes would Dad give away?   5. There are 4 rows of tea cups. Each row has 6 cups. How many cups are there altogether?