This study aimed to improve fourth-grade elementary school students' conceptual understanding and mathematics learning outcomes on multiplication and division of whole numbers through the group discussion method. The study employed Classroom Action Research based on the Kemmis and McTaggart model, conducted in two cycles consisting of planning, action, observation, and reflection. The participants were 10 fourth-grade students. Data were collected through observation, tests, and documentation and analyzed using descriptive quantitative and qualitative methods. The results showed an improvement in learning outcomes, with the average score increasing from 51.50 in the pre-cycle to 66.50 in Cycle I and 80.50 in Cycle II. Learning mastery also increased from 10% to 50%, reaching 90% in Cycle II. Therefore, the group discussion method was effective in improving students' conceptual understanding and mathematics learning outcomes.
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