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This study aims to describe the mathematical critical thinking skills of class VIII students through the development of Student Worksheets based on the Missouri Mathematics Project learning model using Think Talk Write strategies. This research was conducted at junior high school number 11 Lubuklinggau in the Even semester of the 2018/2019 school year with research population were all students of class VIII at junior high school number 11 Lubuklinggau. Data collection technique used was a test technique to measure students critical thinking skills on the material of Cubes and Cuboid. While the data analysis uses descriptive qualitative analysis. Based on the results of data analysis, it was found that the average percentage of students thinking abilities in class VIII was 76.97 and was in the Good category.