<![CDATA[The low level of understanding of angle concepts among elementary school students is a concern in geometry learning. This study aimed to improve the understanding of angle concepts among third-grade students of Class III A at SDN 05 Madiun Lor through the use of Jam Sudut Ajaib media. This study employed Classroom Action Research using the Kemmis and McTaggart model, conducted in two cycles consisting of planning, action, observation, and reflection. The participants were 28 students of Class III A at SDN 05 Madiun Lor in the 2025/2026 academic year. Data were collected through observation, learning outcome tests, interviews, and student response questionnaires. The results showed an increase in teacher activity from 75.65% in Cycle I to 88.19% in Cycle II and student activity from 65.06% to 83.76%. The students’ average learning score increased from 70.00 to 87.86, while classical learning mastery increased from 42.86% to 89.29%, exceeding the predetermined success indicator of 85%. Therefore, the use of Jam Sudut Ajaib media was effective in improving students’ understanding of angle concepts and their mathematics learning outcomes.]]>
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