Students work to solve addition and subtraction problems that have to do with estimating, solving larger addition/subtraction problems, and addition/subtraction properties. Once they solve the problem they check themselves using an ipad or iphone.
I use this as a review center or as a choice on a Tic-Tac-Toe board. My students love it because they are able to use the ipad. I love it because they are enjoying solving math problems and are practicing key concepts from our math unit!