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Packing - 1 pcs Math Roller Stamp for Addition Subtraction Multiplication Division, Math Roller Stamps for Kids, Smart Math Roller Stamps, Addition Teaching Stamps, it can guide kids or children to do mathematical calculation quickly through playing this stamp. The calculation stamp has subtraction model numbers can be freely combined and sorted, so it can cultivate kids' calculation ability. The Teaching stamp is small and lightweight, portable to carry at anywhere, you can add ink for reuse, clear printing, not easy to fade, can be used for long time. The math stamp set as fun as toys, makes learning fun and exciting, increase children's interest in learning ! suitable for students to practice, parent guidance, teacher teaching,