This is a great tool to reinforce multi digit subtracting skills. The cards can be placed inside page protectors giving the option of using white board markers to write on and erase off. There is also space on each card for students to check their work. I used this lesson during small group math time but it can be used in a math center as well. Also included is a second math game to practice those oh so important addition and subtraction skills. Hope you enjoy it!