This is a great way to incorporate some technology into your classroom and get your students really interested.
You will need an iPad or iPod that has a QR scanner app installed. Simply scan the QR code, a 2 digit addition problem will pop up, and the students have to solve on a recording sheet (not included). There are 10 math problems all together. There are also 2 blank cards for you to create your own QR codes if you'd like.
This makes a great whole class lesson or would be great for math centers. Your students are sure to love this - mine did!