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One of the skills that need to be implemented in learning is reasoning skills. The learning model that can be implemented to improve reasoning skills is Malcolm-s Modeling. The objectives of this research was to measure problem solving skill of the students who was taught by Malcolm-s modeling based on KWL thinking strategy towards the minimum criteria scores in the chapter of Scientific Notation. The population of this research were the students of seventh grade in Tainan Municipal Jincheng Junior High School Taiwan in the academic year of 2016/2017. Using cluster random sampling technique, class 705 was selected as the experiment class by giving treatment with KWL thinking strategy using Malcolms Modeling. The data were collected by using some instruments, they were test and documentation and were analyzed by using SPSS software and excel for t-test and proportion test. The results of the research showed that the reasoning skills of students by giving Malcom-s modeling based on KWL thinking strategy gained good result to the scores of the students.