This study aims to determine the effect of Flashcard media on Indonesian vocabulary mastery among second-grade students at MI Muhammadiyah 8 Maccini, Makassar. The study employed a quantitative experimental method using a One Group Pretest–Posttest design. The sample consisted of 25 students selected through purposive sampling. Data were collected through tests, observation, and documentation, and analyzed using descriptive and inferential statistics (normality test and paired sample t-test assisted by SPSS). The results showed that the average score increased from 60.00 (pretest) to 80.40 (posttest), with learning mastery improving from 41% to 100%. The implementation of learning was categorized as high to very high (83% and 86%), while student activity was in the very high category (88% and 91%). The hypothesis test yielded a significance value of 0.001 (< 0.05), indicating that the use of Flashcards has a positive and significant effect on improving students’ vocabulary mastery
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