Three-Corner® Flash Cards
https://theclassroomstore.com/products/threecorner-flash-cards
Self-checking cards teach two math operations. Handy for home, school, or travel.
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Price
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20.95
ea
Self-checking cards teach two math operations. Handy for home, school, or travel. 5 1/2" triangle shape. 48 two-sided cards per set. Choose from addition and subtraction or multiplication and division facts through 12. Individual or small group practice. Sturdy storage box.