<![CDATA[The low ability in basic mathematical operations (addition, subtraction, multiplication, and division) remains a fundamental problem faced by students of SD Negeri 08 IV Koto Aur Malintang, Batu Caluang, Nagari III Koto Aur Malintang Selatan, IV Koto Aur Malintang District, Padang Pariaman Regency, West Sumatra. This community service activity aims to improve students' basic mathematical operation skills through a mathematics competition using the Community Based Research (CBR) approach. The activity involved 13 third-, fourth-, and fifth-grade students selected based on observation and coordination with the school. The CBR stages applied include joint needs identification with the school community, program planning, implementation of the mathematics competition (preliminary round, quick-response round, and final round), and joint evaluation and reflection with the partner. Data were collected through pretest, posttest, observation, and documentation, then analyzed descriptively both quantitatively and qualitatively. The results show an increase in the average score of basic mathematical operation ability from 58.6 in the pretest to 82.4 in the posttest, accompanied by increased enthusiasm, confidence, and active participation of students. The mathematics competition proved to be an effective, enjoyable strategy suited to elementary students' characteristics for strengthening basic arithmetic operations while fostering healthy competitive spirit.
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