<![CDATA[This study aims to analyze students’ mathematical writing skills in terms of habits of mind through the implementation of the Teaching at the Right Level (TaRL)-based Problem Based Learning (PBL) model assisted by Liveworksheet. The research employed a mixed-methods approach with a sequential explanatory design, starting with quantitative data collection using a quasi-experimental posttest control design, followed by qualitative analysis. The participants were seventh-grade students at SMP Negeri 2 Sayung, selected through cluster random sampling and purposive sampling. The instruments included a mathematical writing skills test, a habits of mind questionnaire, observation sheets, interview guidelines, and documentation. The results indicate that the TaRL-based PBL model with Liveworksheet met the criteria for quality learning, with excellent implementation (average student engagement of 89.58%) and the achievement of learning mastery. The t-test (tcount = 3.658 > ttable = 1.670) and proportion difference test (zcount = 11.184 > ttable = 1.67) confirmed significant differences in mathematical writing skills between the experimental and control groups. Qualitative findings further revealed variations in achievement across different habits of mind categories. In conclusion, the TaRL-based PBL model assisted by Liveworksheet is effective in enhancing students’ mathematical writing skills.]]>
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