<![CDATA[Background: Although chatbots are increasingly used in mathematics education, many primarily deliver direct answers or explanations, offering limited scaffolding to guide students systematically through mathematical problem solving. Aims: This study aimed to develop and evaluate a scaffolding chatbot designed to enhance students’ mathematical problem-solving skills in Three-Variable Linear Equation Systems. Method: A research and development approach employing the ADDIE model was conducted with 23 eleventh-grade students. Data were collected through expert validation, teacher and student practicality questionnaires, and pretest–posttest mathematical problem-solving assessments. Data analysis included descriptive statistics, normalized gain (N-gain), the Wilcoxon Signed-Rank Test, and effect size. Results: The chatbot achieved 80.28% validity, while teacher and student practicality scores reached 82.50% and 86.16%, respectively. Students demonstrated moderate improvement (N-gain = 0.45), with a significant difference between pretest and posttest scores (Z = 3.939, p < .05) and a large effect size (r = 0.82). Conclusion: The developed scaffolding chatbot demonstrated strong validity and practicality and provided promising evidence for supporting mathematical problem-solving development through gradual guidance, prompts, and feedback rather than direct solutions.]]>
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