I have created a smart board activity taken from the Math in Focus game, race to 0. The objective of the game is to familiarize students with the concept of subtracting with regrouping. The game instructions are to start at 40 but can be easily modified to accommodate the needs of your students.
Great for use as a time saver explaining the rules of the game whole group or used as a small group work station.
Graphics by: carclipart.com
I hope you enjoy!