Have classroom jobs? Pay them! Pay them for homework. Pay them for correct answers. Pay them for anything positive! Let's reinforce!! And also... make them pay you to use the restroom. They pay you "rent" to sit at their desks. Have ones that always need to get out of their seat? They have to pay you!
Good way to teach money management, good and negative consequences, how money works and get them excited to come in every day! Allow them to "buy" something at the end of the month from the teach