The learning process only focuses on the material by memorizing concepts, students do not use LKPD to do practical work optimally, so the biology learning process in schools does not encourage students to practice critical thinking skills. This study aims to improve students' critical thinking skills by using the PBL learning model combined with STEM-based worksheets on environmental pollution conceptin class 10th SMA Negeri Bireuen district. The approach used is experimental design, the method used is quasi-experimental, with a pretest-posttest design non-equivalent control group design. Population in class 10th IPA SMAN 1 and SMAN 2 Peusangan designed 252 people. The sampling technique used was purposive sampling technique. The research sample was 140 students. The number of samples in the experimental class was 71 people and 69 people in the control class. The instrument used was a reasoned multiple choice question accompanied by a rubric. The data analysis used was n-gain and independent t-test. The results showed that the critical thinking skills obtained was 0.93, with an increase in class critical thinking skills including the high category. The results of the independent sample t-test obtained Sig. (0,000) α (0.05) then Ha is accepted, so it is suggested that there are differences in the critical thinking skills of students between the experimental class and the control class on environmental pollution material in class X SMAN Bireuen. The implementation of PBL learning model combined with STEM-based LKPD can improve students' critical thinking skills on environmental pollution material in class 10th SMA Negeri Bireuen Regency.

The learning process only focuses on the material by memorizing concepts, students have not utilized worksheets to do practical work optimally, so the biology learning process in schools does not encourage students to practice critical thinking skills. This study aimed to determine the effect of implementing STEM-based student worksheets in improving students' critical thinking skills at SMP Negeri 1 Peusangan, Bireuen Regency. This study used a pretest-posttest control group design. The study population was 88 VIII grade students of SMP Negeri 1 Peusangan. The research sample consisted of 67 students. The sample is determined through the purposive sampling technique. The researcher determines the class of the research sample using purposive sampling. The taking of the experimental class and the control class is determined by looking at the standard deviation of the results of the homogeneous pretest of students (the ability of homogeneous students). Critical thinking skills are measured by multiple-choice questions with reason. It is used to determine the increase and difference in the critical thinking skills of students. Analysis of N-Gain test data, paired sample t-test, and independent sample t-test. The results showed that the implementation of STEM-based LKPD could improve students' critical thinking skills on excretory system material in class VIII of SMP Negeri 1 Peusangan. In addition, there are differences in the KBK of students between the experimental class and the control class on the excretory system concept in class VIII of SMP Negeri 1 Peusangan.

This study aims to determine the quality of Discovery Learning Student Worksheets to improve students' critical thinking skills and increase students' Critical Thinking Skills on chemical equilibrium material. This study uses research development methods with the design of the Borg and Gall models. The samples in this study were 140 students of Al-Falah Islamic Senior High School Aceh Besar to develop Student Worksheets and 61 people of IT Al-Fitiyan Senior High School to implement Discovery Learning Student Worksheets. The instruments used were questions and student response questionnaires. The data analysis technique uses the percentage equation and analysis of students' critical thinking skills improvement using the N-gain equation and independent-sample t-test. The results showed that the quality of the Discovery Learning Student Worksheets could improve students' critical thinking skills on chemical equilibrium material, as evidenced by the results of the quality assessment of the Discovery Learning Student Worksheets from the validation results obtained an average of 79% with a decent category. The analysis of students' critical thinking skills proves that there is a difference in the average critical thinking skills of students before and after applying the Discovery Learning Student Worksheet on chemical equilibrium material with a Sig value. (2-tailed) < 0.05. The results obtained prove that the use of Discovery Learning Student Worksheets is better than conventional Student Worksheets in improving students' Critical Thinking Skills

The online learning process creates problems that the practicum cannot be carried out during the online learning process. This problem has an impact on the decline in the level of understanding of students' scientific concepts and process skills. Researchers used a PhET-based STEM approach to overcome these problems. The purpose of this study was to determine the impact of the PhET-based STEM approach in improving students' conceptual understanding of physics subjects at SMA N 5 Banda Aceh. Data collection for this study was conducted in March. Analysis of the data used is a statistical test that is independent-t test. The results show that the use of the PhET-based STEM approach has a very positive impact on improving the understanding of physics concepts that are tested through objective tests. The results of the variable understanding of the concept can be seen from the N-Gain. In the concept understanding variable, the experimental class got a gain value of 0.6 and the control class was 0.5. Both fall into the medium category. So it can be concluded that the PhET-based STEM approach can improve students' conceptual understanding in physics.

Critical thinking skills are competencies that are expected to be possessed by every student in 21st century learning. One of the efforts that can be made to improve students' critical thinking skills is to apply the flipped classroom learning model. This study aims to determine the effect of students' critical thinking skills through the application of the blended learning model of the flipped classroom. The research approach used is quantitative with a quasi-experimental type of research, the research design used is pretest-posttest non-equivalent control group design. Sampling used a total sampling technique from the entire population of 102 students of class XI IPA at SMAN 1 Peulimbang. The instrument used to measure critical thinking skills is in the form of essay questions accompanied by an assessment rubric. Data on critical thinking skills were analyzed by parametric statistics using the independent sample t test. The results showed that the value of < 0.05, then there was an effect of students' critical thinking skills after the application of the blended learning model of the flipped classroom on the respiratory system material

Teaching materials that link the material with the surrounding life to foster an entrepreneurial spirit and creative thinking. One proof of its relevance is using plants as natural developers in making pancakes. The purpose of this study was to develop ethnoscience-based worksheets to determine the feasibility and creativity of students. The method used in this research is development research (R&D) using the ADDIE model. The population for this study was students of class XII IA Senior High School 2 Unggul Ali Hasjmy. The sample was selected purposively, namely 28 students. Data were collected using validation tests and creativity observation sheets. The results showed that the development of worksheets was very feasible to use with the percentage of 85.20 given by the validator. Validation of the creativity observation sheet states that 25 of the 26 items are feasible to use. Student creativity also increased with a percentage of the high category 89.00. Ethnoscience-based worksheets to increase student creativity are feasible to be used as teaching material.

This study aims to determine the effect of student worksheets through the Edmodo network on understanding concepts and learning independence on hydrocarbon material. The research method used is an experiment with a quantitative approach. The research design used was a pretest-posttest control group design. The population of this study was students of class XI SMAN 5 Banda Aceh with data collection techniques by random sampling to obtain two classes that became the research sample. The research instruments used were reasoned test questions and questionnaires. Based on the results of the t-test analysis of conceptual understanding with a significant score of 0.015 <0.05, it shows that there is a significant difference between the control class and the experimental class. The results of the t-test of students' learning independence showed that the significant score was 0.000 <0.05, which means that the data had a significant difference between the control and experimental classes. The conclusion in this study is that student worksheets through the Edmodo network can affect students' understanding of concepts and learning independence. This research concludes that using student worksheets through the Edmodo network in chemistry learning is more effective in increasing understanding of concepts and students' learning independence for the better.

This article discusses the evaluation results of the separation index and fit item of creative thinking skills assessment that supports the conation aspect of prospective biology teachers in Aceh. This assessment consists of 37 items of divergent tasks, which is the application of human physiology courses that support the conation aspects. The participants were selected from the Biology Education Program, Faculty of Teacher Training and Education, Syiah Kuala University. The data were analyzed using the Quest software including the separation index and fit item. The results indicate that the creative thinking skills assessment instrument that supports the conation aspect of prospective biology teachers has a good separation index and all the items fit PCM-1PL.