1) A way to distribute assignments and directions when I have no voice.
I went through about two weeks where I had little to no voice. On the days my voice was the worst, I put directions on QR codes. I sorted the QR codes on my desk (yes I stayed in my desk, I felt awful). The students worked in pairs and when they were finished with one task, I gave them another. It worked very well.
2) A quick way to share a link to a website or activity.
3) A motivational tool.
I add QR code "surprises" to books in my classroom library. They are just little youtube videos that the students are allowed to watch if they make a 100% on their AR test.
4) A way to get information to parents.
This QR code was attached to conference sign-up sheets. The parents scanned the code and that opened a Google Form for the parents to fill out and request a conference.
These are a few ways I use QR codes in my classroom. I will add more to this post as I get more ideas. Please feel free to add comments on how you use QR codes in your classroom.