I would use QR Codes in the classroom for a number of activities. Whether it was literacy, math, science or any subject, QR codes get students used to using technology in a fun and creative way. The student would grab a cube and complete each of the activities as part of a daily task. I would use this in my 1st grade classroom.
10 Simple Ways to Integrate Technology in the Classroom
Seth Dixon's insight: Using technology in education is incredibly important today...but we must remember WHY we want our students using these tools and not accidentally make the tool itself the objective.