This study aimed to determine the effect of the Rangku Alu traditional game based on mathematical generalization on elementary school students learning outcomes in number pattern material. The study used a quantitative approach with a pre-experimental one group pretest-posttest design. The subjects were 35 fifth-grade students from two elementary schools. Data were collected through pre-test and post-test instruments consisting of four essay questions based on indicators of mathematical generalization ability. The results showed that the average score increased from 42,86 on the pre-test to 82,86 on the post-test. The Wilcoxon Signed Rank Test showed a significance value of less than 0,05, indicating a significant difference before and after treatment. The N-Gain value of 0,70 indicated that the learning improvement was in the good category.
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