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The purpose of this topic is to determine students' critical thinking skills and mathematical reasoning on the absolute value topic. This type of research is quantitative study with quantitative descriptive design. Participants of the research are grade X students in three different schools in the Surakarta. The total number of the participants are 83. The data collection technique was carried out by using a test consisting of 4 question items. The Result study shows that students who had low critical thinking skills were 86%, students who had medium critical thinking skills were 12%, and students who had high critical thinking skills were 2%. Whereas for students who have low mathematical reasoning as much as 60%, students who have medium mathematical reasoning abilities are 29%, and students who have high mathematical reasoning abilities are 11%. These results indicate that there are still many students who have low critical thinking skills and there are still many students who have low mathematical reasoning abilities.