Three-Corner Flash Cards (Addition and Subtraction) Retail Price: $7.99 Our Price: $6.99 Save: 1.00 (12.52%) Availability: In Stock        Self-checking cards teach addition and subtraction and the relationship between them. Facts through 12. 48 two-sided cards. 5 1/2' triangles. (Ages 6 to 8) Similar Items you may enjoy! Math Wheel Flash Cards (Addition and Subtraction) Our Price: $7.99 Three-Corner Flash Cards: Multiplication and Division Our Price: $6.99 Flash Action Software Addition Subtraction CD-ROM Our Price: $11.99 Addition and Subtraction Flash Action CD-Rom (Bilingual Edition) Our Price: $11.99