These are math task cards that cover all of the 4.NBT standards. There are 20 task cards with QR codes to use with a QR scanner app, as well as an answer key. I included a standards break down for each question, so either you as the teacher, or students can see which standards they are struggling in. This is a great set of task cards to keep out in your classroom year long for students to practice with, or to use as review for an upcoming test. My class loves using task cards for math centers and the game Scoot! I hope you enjoy these task cards. They are football themed, with a little favoritism towards the Pittsburgh Steelers.