1. Diane bought 7 dolls. Each doll cost $ 3. How many dollars did she spend on the dolls?   2. Barbara has 6 dolls. Each doll has a white dress, a yellow dress, and a black dress. How many dresses are there in all?   3. Andy has 11 toy cars. How many total wheels are there on the toy cars?   4. Andy arranges 10 blocks in a tall stack. He makes 4 such stacks. How many total blocks are there in the stacks?   5. Cheryl multiplied 10 by 9 on her toy calculator. What product did the calculator display?