18 different addition & subtraction themed QR codes!!! By scanning these QR codes, your students will view 18 different read aloud stories, songs, and videos to enhance their understanding of addition and subtraction.This is a great center (or something for your students to do when they finish early or as a reward!)! If you are lucky enough to have access to technology devices (ipods, ipads, tablets, etc.), then this center is for your students! You will need to download a FREE QR Scanner Ap