This study aims to describe the mathematical problem-solving abilities of 5th-semester Mathematics Education undergraduates at Tanjungpura University in solving a PISA model problem shape content level 6. Using a qualitative approach, data were collected through a PISA-based problem and interviews, then analysed through reducing data, presenting data, and drawing conclusions. Results show that 20% of students had high problem-solving ability, 53.33% medium, and 26.67% low. High category students met all problem-solving indicators. Medium category students reached the carrying out the plan indicator but skipped looking back due to confidence in their solution and time constraints. Low category students only met the understanding the problem" indicator and struggled to identify appropriate strategies and formulas.
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