You know what QR codes are ... those black and white patterned squares you scan with your smartphone to be taken to a webpage with more information about, well, anything! They've been popping up everywhere, from restaurant menus to PTA flyers. QR stands for "Quick Response" because scanning the code takes you to a new location instantly. But did you know that QR codes are super useful in the classroom, too? QR codes can send the student to a webpage, a Dropbox file, a Google Maps location, or even a word or number in plain text format. This opens up all kinds of possibilities, but the one I want to address is how QR codes can solve the answer key problem.