NFL St. Louis Rams Addtion and Subtraction Flash Card Set Includes One Box of Addtion Flash Cards and One Box of Subtraction Flash Cards A Proven Learning Tool That Helps Reinforce and Build Math Skills Goes Anywhere and Can be Used Alone or With Others A Great Way to Interest Your Child in Math and Make Learning Fun Large, 3 1/2 x 5 1/2 Cards Makes it Easy for Kids to Handle and Read.