This is a fun way for your students to practice multiplicative comparison problems. Students will move around the room solving problems. Each card has a QR code that when scanned will provide a problem for students to solve. After they record the answer on their answer sheet, they will then need to search the room for another card that has that answer on it. Once they find it they will scan the next code located on that card and solve the next problem. It is so much better than a traditional worksheet. The students will have so much fun with the movement and technology that they won't even realize they are doing work! The 16 cards correlate with the fourth grade common core 4.OA.2. This product is also available in a non-QR Code Format.