This research aims to develop a Problem-Based Learning Based Mathematics Teaching Module to Improve the Mathematical Critical Thinking Ability of Elementary Students and test its quality based on validity, practicality, and effectiveness. This research uses the ADDIE development model (Analyze, Design, Develop, Implement, and Evaluate). This research was conducted on 23 fifth-grade students at SDN Pakujajar CBM. The instruments used in this study were validation sheets by material and media experts to test the validity of problem-based learning-based mathematics teaching modules, teacher and student response questionnaires to test the practicality of problem-based learning-based mathematics teaching modules, and student mathematical critical thinking ability tests to test the effectiveness of problem-based learning-based mathematics teaching modules. Data analysis techniques in this study used Hypothesis Test and N-Gain. The results of the study obtained are: (1) The problem-based learning mathematics teaching module is included in the very valid category. (2) Based on the teacher and student response questionnaire, a very good response was generated regarding the teaching module developed, and the problem-based learning mathematics teaching module was included in the very practical category. (3) Based on the results of the Hypothesis Test and N-Gain analysis, it shows an increase in students' mathematical critical thinking skills in the moderate category, so the problem-based learning-based mathematics teaching module is declared effective.
                        
                        
                        
                        
                            
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