<![CDATA[ Abstract:This Classroom Action Research is conducted to improve students’ vocabulary mastery through Jumbled Letters Game.. Field notes were also used to monitor the teacher and students’ performance. The result of data analysis showed that class VIIA students got their progress in mastering vocabulary. In the first cycle, the students’ mean score of vocabulary mastery was only 58.57 and categorized as poor. By doing all the steps of classroom action research, the process of teaching and learning was evaluated and modified, including providing clues for the students during playing the game. Then in the second cycle, the mean score of the students was improved to 72 which categorized as good. It showed that there was an improvement of the students’ English vocabulary mastery after applying the jumbled letters game during teaching learning activity. Keyword: vocabulary mastery, jumbled letters game, improving Abstrak: Penelitian Tindakan Kelas ini dilakukan untuk meningkatkan penguasaan kosa kata siswa melalui Permainan Huruf Bercampur Hasil analisis data menunjukkan bahwa siswa kelas VIIA mengalami kemajuan dalam penguasaan kosa kata. Dalam siklus pertama, nilai rata-rata siswa hanya 58.57 dan kategorinya buruk. Dengan melakukan semua langkah-langkah dalam penelitian tindakan kelas, proses belajar mengajar dievaluasi dan dimodifikasi, termasuk menambahkan petunjuk bagi siswa selama bermain. Kemudian di siklus kedua, nilai rata-rata siswa meningkat menjadi 72 dan kategorinya baik. Ini menunjukkan bahwa terdapat peningkatan dalam penguasaan kosa kata Bahasa Inggris oleh siswa setelah menerapkan Permainan Huruf Bercampur selama aktifitas belajar mengajar. Kata kunci: penguasaan kosa kata, permainan huruf bercampur, meningkatkan]]>
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