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This study aims to determine the Effectiveness of the Treffinger Learning Model in Improving the Ability to Understand Mathematical Concepts and Critical Thinking Skills of SMA Negeri 2 Bengkulu City Students in the even semester of the 2022/2023 academic year with the research population being all students of class XI, totaling 1,284 students and a research sample of 72 students consisting of 2 classes namely class XI MIPA U as the experimental class and class XI MIPA A as the control class. The research instrument is a test of understanding mathematical concepts and critical thinking skills. Data analysis was performed using the multivariate analysis of covariance (MANCOVA) test. The results showed that there was an influence of the Treffinger learning model on understanding mathematical concepts and critical thinking skills together at 78.7%. Furthermore, the effect of the Treffinger learning model on understanding mathematical concepts is 72.3% and the influence of the Treffinger learning model on critical thinking skills is 78.6%. The average score of students in the class taught by the Treffinger learning model is higher than that of students taught by using the Scientific learning model. The average understanding of mathematical concepts in the experimental class was 80.667 and the control class was 62.5. The average critical thinking ability in the experimental class was 78.13 and in the control class was 58.76

This study aims to determine the effect of the Everyday Mathematics (EM) Learning Model on Students' Critical and Creative Thinking Ability. This type of research uses the Quasi Experiment method. Data collection is done through tests. Data analysis used the Ancova test. The sample of this research is students of SMPN 01 Lebong class VII.4 and VII.6. The results showed that: There is a linear influence of initial ability covariates on students' critical thinking skills with an effect of 62.6%. There is a linear influence of initial ability covariates on students' creative thinking abilities with an effect of 22.7%. There is an effect of applying the Everyday Mathematics learning model to students' critical thinking skills with an effect of 82.9%. There is an effect of applying the Everyday Mathematics learning model to students' creative thinking abilities with an effect of 6.5%. the achievement of critical thinking skills taught through learning using the Everyday Mathematics learning model is better than that taught through conventional learning. the achievement of creative thinking skills taught through learning using the Everyday Mathematics learning model is better than that taught through conventional learning