1.  Debbiebought two dolls for $ 71 . She had $21 in her purse. How many dollars are left in her purse?   2. Michelle  has two dolls. The first doll is 66 cm tall and the second is 48 cm. What is the difference in their heights (in cm)?   3. Stevewent to play in the garden with 64 marbles. He returned home with 49 marbles. How many marbles did he lose?   4. Gary arranges 65  blocks in a tall stack. Accidentally, he drops37 blocks. How many blocks are still there in the stack?   5. Each day  686 buses are made in a toy factory. Of these, 95 are defective. How many toy vehicles are not defective?