This classroom action research aimed to improve the English vocabulary mastery of second-grade students at Madrasah Ibtidaiyah Negeri 1 Tangerang Selatan through the use of flashcards. The study was conducted in two cycles, each consisting of planning, implementation, observation, and reflection stages. The results indicated a significant improvement in students’ vocabulary mastery. In the pre-cycle, only 39% of students achieved the minimum passing grade. After the first cycle, the percentage increased to 50%, and in the second cycle, it reached 92%. The findings suggest that flashcards are effective learning media in enhancing students’ vocabulary acquisition and motivation. Flashcards also provided an enjoyable learning atmosphere, preventing boredom during English lessons.
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