Trend Three-Corner Add/Subtract Flash Card Set - Educational - 1 / Set

Self-checking cards teach addition, subtraction and the relationship between them. Ideal for groups or individuals at school, home or travel. Set includes 48 two-sided, 5-1/2" triangular cards that focus on numbers through 12 and a sturdy storage box. Durable, easy-to-hold cards are designed for teaching students ages 6 to up.