GO MATH game for the day after teaching the 2.1 lesson. Students should work in high/low partners and check each other. If they both have the same answers they get a sticker from their partner over the number. If there is a disagreement they can use the emergency calculator and check their answer. They should be able to figure it out that way, if not they use me as a last resort. The sticker system helps me to quickly grade them when done. I grade them out of the total they got to NOT 12 (unless they did 12).