Checkbook Practice Basic Addition and Subtraction for 3-5th grade. Each morning I give the students a new thing they have to buy and add to their checkbook. It's easier said than done. Students tend to make mistakes in general computation so they have to be very careful. I included a parent letter explaining things as well as the blank checkbooks ( I copy each week for them) (excel file) You will have to make up your own morning item to buy. Example. Today you bought a shirt for $16.89 or today you received $80.68 refund.