This research aims to analyze the effectiveness of differentiated learning on the mathematical problem solving abilities of class VII students at SMP Negeri 2 Rantau Selatan, Labuhanbatu Regency, academic year 2023/2024. In this research, researchers used descriptive qualitative research methods. In this research, efforts were made to collect as much descriptive data as possible which will be expressed in the form of reports and descriptions. Research on class VII-I students at SMPN 2 Rantau Selatan to see the problem solving stages according to Polya's theory in that class. Of the 32 students studied, the researcher took 4 students from the class who represented each stage according to Polya's theory and interviewed them in more depth. The results of this research conclude that differentiated learning provides opportunities for students to understand the material according to their respective learning styles. So that differentiated learning is effectively used as a new method and is useful for students' mathematical problem solving abilities. Keywords: Effectiveness, Differentiated Learning, Problem Solving Ability
                        
                        
                        
                        
                            
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