1. Cheryl bought 7 dolls for $ 7. She had $ 33 in her purse. How many dollars are left in her purse?   2. Sarah has two dolls. The first doll is 8 cm tall and the second is 5 cm. What is the difference in their heights (in cm)?   3. Andy had 60 marbles in his school bag. He returned home with 52 marbles. How many marbles did he lose?   4. Andy arranges 9 blocks in a tall stack. Accidentally, he drops 4 blocks. How many blocks are still there in the stack?   5. Each day 64 cars are made in a toy factory. Of these, 5 are defective. How many toy vehicles are not defective?