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This research is a research through scientific approach by using problem solving to improve the mathematical understanding ability of vocational students. This research is a quasi-experimental form which aims to test the achievement and improvement of students mathematical understanding skills through a scientific approach using problem solving rather than learning that only uses a scientific approach. And examine the implementation of learning steps through a scientific approach using problem solving. The population in this study were all students of class X Vocational School in Bandung Regency, while the sample was class X students from one of the Vocational Schools which were determined purposively and were randomly selected from the existing class X. Based on the results of data analysis, it was concluded that the achievement and improvement of the mathematical understanding ability of Vocational students who obtained learning through the scientific approach using problem solving was better than those who obtained learning using the scientific approach only.And the implementation of learning through a scientific approach using problem solving is carried out in accordance with the planned learning steps.