The problem-solving skills are needed to encounter challenges of the globalization era, whereas research about the application of teaching materials based on 7E-STEM learning cycle to improve student's problem-solving skills is still limited. The purpose of this research is to know the problem-solving skills improvement score after the treatment. The methods employed were the quasi-experimental research with one-group pretest-posttest design, and the respondents were 29 students in the eleventh grade of high school. The instrument used in this study is called a problem-solving skills test with a reliability of 0.715. The instrument used to collect qualitative data is a questionnaire given to students. Data analysis used descriptive statistics, normality test, Wilcoxon test and N-gain score. The results of questionnaires are analyzed using the percentage between scores obtained compared with the expected score. The results showed that the improvement of problem-solving skills classified to the medium category. The improvement it caused by during the treatment using teaching material can help in directing student activities, students are actively involved, and students get direct experience. The results of the questionnaire showed that students responses to learning were good, but student felt the delivery of the material was too fast so that it had an impact on the results of students' problem-solving skill scores. © 2020 Author(s).
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