<![CDATA[This study aims to improve the learning outcomes of mathematics Grade III students of SDN 067259 Medan Johor district on flat building materials through the application of Contextual Teaching and Learning (CTL) learning models. The background of this study is based on the low learning outcomes and lack of enthusiasm of students in following the learning of mathematics. This study uses the approach of classroom Action Research (PTK) Kemmis and McTaggart model which is implemented in two cycles. Each cycle consists of stages of planning, implementation of actions, observation and reflection. The subjects of the study were 20 students of Class III. Data collection techniques are conducted through observation, learning outcomes tests, and documentation. The results showed that the application of CTL model can improve student learning outcomes. In the first cycle, the percentage of students ' learning completeness reached 60%, then increased to 85% in the second cycle. In addition, students ' learning activities also increased, where students were more active, enthusiastic, and able to associate the concept of waking up flat with everyday life. Thus, the CTL learning model proved effective in improving students ' understanding and learning outcomes on flat building materials.]]>
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