The Use of Duolingo to Boost Students’ Vocabulary Mastery at Seventh Grade in Class An-Nisa of SMP Muhammadiyah At-Tanwir Metro

This study examines the effectiveness of Duolingo in boosting students’ vocabulary mastery in the seventh grade of class an-nisa at SMP Muhammadiyah At-tanwir Metro. Using Classroom Action Research (CAR) with two cycles, data were collected through tests and observations. Results show a significant improvement: the percentage of students meeting the passing score increased from 17% (pre-test) to 34% (post-test I) and 100% (post-test II). Additionally, students’ engagement and motivation in learning English also increased, as observed through their participation and enthusiasm during lessons. Based on the findings, it is recommended that English teachers integrate Duolingo as a supplementary tool to enhance vocabulary learning. Future research could explore its impact on other language skills, such as speaking and listening, to provide a more comprehensive understanding of its effectiveness in English learning.