This is a great way to review the ways to write a number while also integrating technology! Just cut the cards in half, and mix them up for the cooperative groups. They will then work together to connect the correct cards together. They will check their work by scanning the QR code. If they get it right, a positive message will appear! If you would like any custom made "cut and connect" QR code activities, please feel free to email me at firstname.lastname@example.org. Thank you!