Complete Arithmetic Skill Builder: Covers all basic arithmetic skills with multiplication, division, addition, and subtraction exercises. The 15 double-sided, multifunctional cards support differentiated learning for different ages and qualification levels. Durable moisture-resistant construction: Laminated finish resists moisture and color fading to ensure long-term use. The thick coated paper allows smooth writing and erasing, ideal for reinforcing multiplication tables, division facts, or algebra concepts. Interactive self-check system: Front of each card presents focused arithmetic practice; back shows answers with guidance. The bidirectional design helps users diagnose mistakes and reinforce understanding. Travel-friendly kit: Includes a dry-erase marker and sorting cards for practice anywhere. Compact and lightweight, designed for on-the-go learning during travel, holidays, or study breaks. Use cases: At-home practice, on-the-road learning, or quick study sessions.