Print the QR codes and post them around the room. Students will visit the code, scan it with an ipad/ipod or web cam. Solve the problem and record their answer in the appropriate box on the record sheet. We had the students do it in pairs. They visited the code, scanned it with their device and returned to their seat to count the money and record it on their sheet. The students were extremely motivated and engaged. I hope you experience the same success with your students.