QR (short for Quick Response) codes are seen everywhere but are often overlooked. They are small codes which require a code reader to scan and decode. Teachers can create their own QR codes for students to 'decode' on everything from worksheets, books, scavenger hunts, or just about anything. The ideas are limitless and you can use your imagination to tag just about anything. You can check out this 40 interesting ways to use QR codes in your classroom.