1. Grahaminvites 52 boys and 38 girls to his birthday party. How many friends did he invite?   2. There are 17 cakes. Each cake is cut into 8 pieces. How many pieces are there in all?   3. There are 64 sandwiches to be arranged equally in 4 trays. How many sandwiches will there be in each tray?   4. Dad has planned 20 games for the party. Each game would have 10 winners. How many prizes would Dad give away?   5. Mom places 17 paper plates on the table in 9 rows. How many paper plates are there in each row?