<![CDATA[This study aims to describe the implementation of the PHIBAR (Papan Hitung Bilangan Ratusan) media in improving students' ability to perform addition of three-digit numbers and to analyze the improvement in their skills after using this media. The research was conducted in the fourth grade of SDN Dukuh Kupang 1 Surabaya, involving 28 students as research subjects. The method used was Classroom Action Research (CAR) based on the Kemmis and McTaggart model, carried out in two cycles, with each cycle consisting of one meeting. Data were collected through observation, interviews, and tests. The results indicated that the use of PHIBAR media significantly improved students' ability to perform addition of three-digit numbers. The percentage of students achieving mastery increased from 39.29% in the pre-cycle to 64.29% in the first cycle and reached 89.29% in the second cycle. Additionally, the class average score improved from 68.21 to 86.43. The PHIBAR media proved to be effective in visualizing abstract concepts into concrete representations, helping students understand place value and carrying processes in accordance with their cognitive development stages.]]>
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