First graders have been learning about and practicing adding and subtracting 10 to 2-digit numbers. Plus and Minus 10 is a wonderful game that involves using a 120 chart as a visual aid to help students learn about this skill. We first played a round of this game with a giant sized 120 chart as a group. Then partners played their own game and recorded all of their equations. Some of them are ready for the next challenge of doing +/- 20 or trying out the game with a 200 chart and some 3-digit numbers!