1. Sarah bought 3 dolls for $ 3. She had $ 87 in her purse. How many dollars are left in her purse?   2. Michelle has two dolls. The first doll is 74 cm tall and the second is 65 cm. What is the difference in their heights (in cm)?   3. Herbert had 73 marbles in his school bag. He returned home with 65 marbles. How many marbles did he lose?   4. Herbert arranges 10 blocks in a tall stack. Accidentally, he drops 3 blocks. How many blocks are still there in the stack?   5. Each day 41 buses are made in a toy factory. Of these, 7 are defective. How many toy vehicles are not defective?