<![CDATA[This classroom action research aimed to improve students’ mathematics learning outcomes on the topic of measuring object length through the implementation of Detective Measurement Media integrated with the Problem Based Learning (PBL) model in first grade students of SDN Sukun 2 Malang. The study applied the Kemmis and McTaggart model consisting of four stages planning, action, observation, and reflection. The research was conducted in two cycles involving 28 first grade students, consisting of 16 boys and 12 girls. Data were collected through tests, observations, and documentation, while the data analysis employed quantitative and qualitative approaches.The findings revealed that the use of Detective Measurement Media based on PBL was able to improve students’ mathematics learning outcomes. In Cycle I, the class average score reached 72.10 with a classical learning mastery percentage of 71.43%. After improvements were made in Cycle II, the average score increased to 86.40 and the classical mastery percentage reached 92.86%. In addition, students became more active, enthusiastic, and cooperative during the learning process.Based on these findings, it can be concluded that the implementation of Detective Measurement Media integrated with the Problem Based Learning (PBL) model is effective in improving mathematics learning outcomes on measuring object length for first grade students of SDN Sukun 2 Malang.]]>
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