This game is 2-digit addition with regrouping. I like to have my students practice the skills taught with games and not worksheets. They get enough worksheet practice in their math workbooks. This game is one I used to have my 5th graders play with various skills. It uses smaller cards and uses a Kleenex box which is relatively easy to get and recycle with a label. This game can be played whole group with teams or as a partner practice game.