Good try! You almost finished on time
You're doing much better!
The effect on behavior
If you stay outside for 10 more minutes, then you must do your entire math problems
If you finish all your work, then you may have free timme for 10 minutes
If you are the line leader for today, then you must be quiet during study period
If you get a drink of water, then you must stay in your seat the rest of the day