This is a fun way for your students to practice with place value. Students will move around the room solving problems. Each card has a QR code for students to scan which will give them a problem to solve and 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 new code 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.NBT.2.