1. Stacy bought 6 dolls. Each doll cost $ 4. How many dollars did she spend on the dolls?   2. Barbara has 2 dolls. Each doll has a white dress, a green dress, and a yellow dress. How many dresses are there in all?   3. Darren has 9 toy cars. How many total wheels are there on the toy cars?   4. Darren arranges 8 blocks in a tall stack. He makes 7 such stacks. How many total blocks are there in the stacks?   5. Cheryl multiplied 5 by 9 on her toy calculator. What product did the calculator display?