This study aims to describe the improvement of students' Mathematical Critical Thinking Ability (MCTA) through the Think Pair Share (TPS) Cooperative learning model. This type of research is a quasi-experimental with Nonequivalent Control Group Design. The population in this study were students of class X SMA Negeri 2 Padangsidimpuan. Through purposive sampling, research samples were taken from class X IIS 2 as the experimental group and class X IIS 1 as the control group. The research instrument includes an observation sheet on learning activities and student MCTA tests which include pretest and posttest questions. Data analysis using N-gain score, t-test. Analysis of the observational data showed the average value of learning management with a score of 4.48. Obtaining N-Gain with t-test on student MCTA data obtained a significance of <0.05. The average acquisition of the N-gain MCTA index of students in the experimental class was 0.42 and in the control class was 0.29. Through two-way ANOVA at the gender level with a learning model to improve students' MCTA, a significance of 0.736>0.05 was obtained. It was concluded that the application of TPS-type cooperative learning in improving students' MCTA was good. The TPS-type cooperative learning model's improvement was better than the regular MCTA of students.
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