This research aims to find out whether or not online learning affects the mathematical critical thinking skills of class VIII. The method used in this study is Pre-Experimental Designs with a quantitative approach, this research design uses a one-group pretest-posttest design. The subject of this study is a class VIII student at Madinatul Ulum Jombang Junior High School in the 2021/2022 school year. The instruments used in this study are tests and non-test. The data collection techniques in this research are test and Questionnaire test, and data analysis using t-test with the help of SPSS application version 16 for windows. The results of online learning on mathematical critical thinking skills obtained a significance value of < 0.05, namely a test significance value of 0.003 < 0.05 and a Questionnaire significance value of 0.000 < 0.05. This shows that there is an influence of online learning on the mathematical critical thinking skills of grade VIII students.
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