1. Sarah bought 7 dolls for $ 7. She had $ 46 in her purse. How many dollars are left in her purse?   2. Stacy has two dolls. The first doll is 14 cm tall and the second is 10 cm. What is the difference in their heights (in cm)?   3. Graham had 47 marbles in his school bag. He returned home with 44 marbles. How many marbles did he lose?   4. Graham arranges 12 blocks in a tall stack. Accidentally, he drops 5 blocks. How many blocks are still there in the stack?   5. Each day 74 cabs are made in a toy factory. Of these, 4 are defective. How many toy vehicles are not defective?