Include in this product are 3 sets of 12 subtraction task cards that have QR Code Answers.(36 cards) The QR Code is optional for self checking. This center can be completed without scanning. Cards have letters in the corner and can be used as a write the room center. Matching recording sheets are included. To access the QR code on each card you will need to download a free QR reader on your iPad, iPhone, iPod touch. This is a great, easy way to integrate technology into center time.
QR Custom Category in my store to see more QR Code products. Here are a few links to math centers that may interest you.
QR Code (Optional) Missing Number Task Cards 0-20 Frogs
Add The Room Baseball (with bonus memory game)