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This app-tivity is sooooo easy to create! I use the QR Beamer app to type in a problem and create the QR code. Then I save the code to my camera roll. In Word or Pages, I type one of the answers at the top of the page and insert the picture of the QR code at the bottom of the page (make sure the answer doesn't go with the problem that the QR code brings up when they scan it -- mix them up). Scan all the codes you create to make sure they work. I also like to create a worksheet for them to show their solutions to each problem. Make sure to explain to your students that they must use the "clues" to lead them to the next problem, and that they cannot just go to any QR code they want to.