These cards incorporate the technology of QR codes to get students active and moving about the classroom. Not only will you keep your students engaged, you'll also have the opportunity to teach them about QR codes.
Scratch-off templates can be printed off and used as rewards in the classroom. Combine some silver acrylic paint and dish soap, and then paint that over the white square. When it dries, the text should be covered off and students can "scratch off"