BEST Activity Ever! I actually made it and used today (when I posted it) and the students were amazingly engaged for the longest time, doing the same activity! They absolutely LOVED IT!
How it Works:
I taped down one card per desk. Then, every four questions, there is a QR Code to check the previous four answers. This way, if they are needing to change how they do the questions, or perhaps, as I saw it help a few today, they may have been adding when they were supposed to be subtracting.