Pinit TREND Addition & Subtraction 3-Corner Flashcards(0) No Reviews yet SKU: T-1670 $11.99 Quantity discounts available QuantityPrice Quantity -+ Add to Shopping Cart Details Self-checking cards teach addition and subtraction and the relationship between them. Facts through 12. Includes 48 two-sided cards. 5-1/2” tria... DetailsBackDetailsSelf-checking cards teach addition and subtraction and the relationship between them. Facts through 12. Includes 48 two-sided cards. 5-1/2” triangles. Grades 1-3, ages 6-8. Reviews 0 BackRatings & ReviewsNo reviews availableBe the first to Write a Review