Many of you have asked me, "what exactly are QR codes, and how can I use them in my classroom?" First of all, QR stands for Quick Response-which is exactly how we should use it in the classroom. Students love immediate feedback in math (or any other subject), and QR codes provide that for them. Last fall I went to the GaETC conference in Atlanta, GA and one of my favorite speakers, Tony Vincent, lectured on using QR codes in the classroom. Here is his video, as well as some resources for QR codes in the classroom.