5. Aila collected 28 stickers. She gave 15 stickers to her friend. Then one day, her mother bought her 5 stickers. How many stickers does she have now? A. 28 B. 18 C.15 D. 5
6. What operation do we need to use to solve the problem? A. addition and multiplication B. subtraction and division C. subtraction and addition D. multiplication and division