Addition and subtraction are the foundation of math success! Four colorful flash card sets in this one little package offers 4 times the learning! They’re perfect for home and classroom. Our proven flash cards will introduce essential addition and subtraction skills for first graders. The combination advances abilities, while also allowing for backtracking and reinforcing problems that still need practice. Do speed drills, play games, change it up! Parent cards in the decks suggest more activities that help kids develop essential skills. Take them anywhere! Learning that goes where you go!