Classroom Lottery Tickets are used as rewards in my class. This document is generic, so it can be used in any class! I have these cards glued to cardstock and individually laminated for reuse. I have scratch-off paint (made using pinterest!) painted over each box, and my students know to scratch only one box to reveal their reward!
This works great with Classroom Bingo, a Top Five Expectations list, or just as positive reinforcement for individual behavior!