1. Diane bought 9 dolls for $ 9. She had $ 56 in her purse. How many dollars are left in her purse?   2. Debbie has two dolls. The first doll is 79 cm tall and the second is 71 cm. What is the difference in their heights (in cm)?   3. Robin had 13 marbles in his school bag. He returned home with 6 marbles. How many marbles did he lose?   4. Robin arranges 10 blocks in a tall stack. Accidentally, he drops 8 blocks. How many blocks are still there in the stack?   5. Each day 97 cabs are made in a toy factory. Of these, 8 are defective. How many toy vehicles are not defective?