1. Sarah bought 3 dolls. Each doll cost $ 5. How many dollars did she spend on the dolls?   2. Stacy has 8 dolls. Each doll has a green dress, a yellow dress, and a black dress. How many dresses are there in all?   3. Jack has 2 toy cars. How many total wheels are there on the toy cars?   4. Jack arranges 9 blocks in a tall stack. He makes 5 such stacks. How many total blocks are there in the stacks?   5. Barbara multiplied 9 by 5 on her toy calculator. What product did the calculator display?