Trend Enterprises: Three-Corner Addition and Subtraction Flash Cards, Interactive Self-Checking Cards, Exciting Way for Everyone to Learn, 48 Two-Sided Cards Included, Ages 6 and Up

These cards allow students to learn the relationship between operations. Each Three Corner flash card teaches a family of facts. Each set has two operations and 46 two sided cards. Standard Focus: addition and subtraction computation, fact families. Sold as Single Unit. Self-checking cards. Helps students learn addition and subtraction and the relationship between them. Covers facts through 12. includes 48 two-sided cards.