1. Michelle bought 2 dolls. Each doll cost $ 3. How many dollars did she spend on the dolls?   2. Sarah has 10 dolls. Each doll has a blue dress, a green dress, and a red dress. How many dresses are there in all?   3. Mark has 4 toy cars. How many total wheels are there on the toy cars?   4. Mark arranges 8 blocks in a tall stack. He makes 3 such stacks. How many total blocks are there in the stacks?   5. Stacy multiplied 7 by 9 on her toy calculator. What product did the calculator display?