<![CDATA[Based on classroom observations, it is evident that most teachers utilize conventional methods or lecturing, resulting in a less conducive classroom atmosphere. Therefore, there is a need for innovation in classroom learning, one of which involves implementing the Problem Based Learning (PBL) model. The aim of this research is to enhance the mathematics learning outcomes of grade 1 students at SD IT PERMATA. This study employs the Classroom Action Research (CAR) method, with grade 1 students at SD IT PERMATA as the subjects, focusing on their mathematics learning outcomes regarding the measurement of object lengths. The action research was conducted over two cycles, comprising initial reflection, action planning, implementation, observation/data collection, and reflection phases. Data were gathered through observations and written tests using observation sheets and descriptive questions. Descriptive analysis was employed for data analysis. The results of the action research indicate that (1) the application of the PBL model effectively improves mathematics learning outcomes in the measurement of object lengths, and (2) implementing the Problem Based Learning model shows a significant improvement in student learning outcomes in Mathematics, particularly in the measurement of object lengths in grade 1 at SD IT PERMATA. This is evident from the increase in the average score from 56.93 pre-action, with 10 students (33.33%) meeting the Minimum Mastery Criteria (KKM), to 70.00 in cycle I. Moreover, there was an increase in the KKM standard from 63.33% in cycle I to 86.67% in cycle II, with 26 students (86.67%) meeting the KKM standards]]>
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