Mathematical problem solving skills are one of the important skills that students have in learning mathematics. The purpose of this study is to describe students' mathematical problem-solving ability to solve PISA problems on quantity content. This research uses qualitative methods. The subjects in the study were students of class IX A SMPN 2 Tirtamulya. The data collection technique in this study is to provide a test in the form of two PISA Math problems. The results of this study are the average score of mathematical problem-solving skills of students classified into the medium category, which is 10.33. Students' mathematical problem-solving abilities in high categories meet the entire stage of problem solving, namely understanding problems, devising a plan, carrying out the plan, and looking back. The mathematical problem-solving ability of students in medium category is fulfilling the stage of devising a plan and carrying out the plan. Students' mathematical problem-solving abilities in low categories meet one of four stages, namely devising a plan.
                        
                        
                        
                        
                            
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