I love QR codes, it is cool that you can program them to take you to websites or give messages. After students got busy on the task they then scanned the answers they wanted from the board.
Each code was programmed with a different message based on what I think they may have done to get their answer. If they were correct the code directed them to the next step, which was to write a quick set of notes in their math notebook and practice a few problems.
The final step was a worksheet that we checked before class ended.
Very productive day in the 6th grade.