This activity is 12 slides that have a problem (adding or subtracting decimals) for students to solve. Great for 5th or 6th grade. Students look around the room and find the answer (or rework the problem) and then work the next problem listed underneath. Its great for extra practice and practically self-checking. The key is easy to figure out (answers are on the following slide, answer to last problem on first slide). I hope it makes a usefull addition to your lesson plans. Happy teaching!