Dynamic math reinforcement Multifunctional flash cards cover multiplication, division, addition and subtraction to provide varied practice that strengthens essential arithmetic skills. Durable use Cards resist wear, water and fading with daily handling. Designed for repeated practice, they survive erasing and rewriting while keeping crisp visibility. Interactive self-examination system Front of each card presents focused exercises; back reveals answers with instructions. The bi-directional design lets learners self-check, diagnose errors and consolidate understanding. Travel-ready size Compact and lightweight, this kit includes an erasable pen and sorting cards for practice anywhere. The travel-friendly design supports quick math drills on the go. Use scenarios - In the car or during travel: practice on the move with the erasable pen, then check answers on the back. - At home or during study breaks: short arithmetic drills to reinforce skills between lessons. - During tutoring or classroom sessions: ready-to-use prompts and self-checks to support immediate feedback and mastery.