Student Observation Sheets Research Articles

Playful Pathways to Age-Appropriate Sexual Education: Crafting Board Game Media for 4-6-Year-Olds

Sex education is very important for early childhood because it helps children avoid the rampant cases of violence that have recently occurred in children. In addition, knowledge related to sex education among educators, parents and even BKB cadres is still minimal. Therefore, it really needs the right media to educate in giving sex education properly. This study aims to develop a board game to introduce sex education from an early age to children aged 4-6 years, in addition to testing the feasibility of board games in terms of validity and effectiveness. This research is research and development using the ADDIE model. The sample in this study was 30 children aged 4-6 years in the KB village of Ambon city. The data in this study were obtained through two main techniques, namely interviews and observations. In the initial phase, the data were analyzed qualitatively to understand the perspectives held by Family Planning (KB) facilitators and parents regarding early childhood sex education. Subsequently, in the evaluation phase, quantitative analysis was conducted using descriptive statistics obtained from expert validation, teacher response questionnaires, and student observation sheets. The results of this analysis were used to provide insights into the validity, utility, and effectiveness of the product developed in this research. The feasibility of using board games, seen from the aspect of validity, was obtained through the assessment of media experts and material experts. In contrast, the effectiveness aspect was obtained through observing the ability to understand sex education in children aged 4 to 6 years. The results showed that the board game was feasible in terms of the validity aspect of the material in the very good category, the validity aspect of the media in the very good category, and the effectiveness aspect in the good category.

Implementation of the Treasure Hunt Learning Model in Mathematics Subjects

Mathematics is a subject that must be studied from elementary to upper level. 85% of Mathematics teachers only use learning in the classroom and do not use innovation in learning. Therefore, this research was conducted involving 22 students from class IV of Mantup 1 State Elementary School, consisting of 11 girls and 9 boys, with the aim of creating innovation in Mathematics learning that can increase students' interest and collaboration in multiplying decimal numbers. using the Treasure Hunt model. Data was collected in two research cycles through the use of questionnaires, notes and student observation sheets. According to the data analysis carried out, the Treasure Hunt method seems to have helped students learn multiplication and division of decimals. Only 15% of students in the low category completed collaborative tasks before the intervention. The results of this research are that learning mathematics can not only be done indoors, but can be done outdoors, such as using the Treasure Hunt learning model. The use of the Treasury Hunt learning model in Mathematics subjects involves all aspects of teacher activities, student participation, and student learning activities. So with the Treasure Hunt learning model, students are more motivated and learn new things.
 Keywords: Mathematics, interest in learning, collaborative, Treasure Hunt.

Comparison of the Characteristics of Learning Responsibility and Science Process Skills of Junior High School Students in the Material of Composing Different Particles

Learning science is one of the ways that education works to improve the quality of human resources by enhancing personality and abilities. In this study, researchers adopted a specific quantitative methodology. The research instrument used a student learning responsibility questionnaire with 25 statements and observation sheets of students' scientific inquiry skills with 18 statements ranging from very bad to very good. 237 junior high school students from state schools on the east coast grade 7 were used as research samples selected using purposive sampling technique. Data from the research sample can be evaluated after it has been gathered. Both descriptive and inferential statistics were used in the data analysis. The results showed that there was a significant relationship between learning responsibility and science process skills of junior high school students in suburban cities. There is a positive and unidirectional relationship between student responsibilities and students' science process skills in science subjects for junior high school students in suburban cities as indicated by the correlation between student learning responsibilities and science process skills, a correlation coefficient of 0.710 is obtained. Based on the results of the Follow-up Test, the average responsibility of the three junior high school students in suburban cities is significantly different from the significance value used, which is 0.05. The significance value obtained for the character of responsibility is 0.020 which is lower than the significance value used, which is 0.05. The researcher suggests that future scientists utilize research findings as a source of information to carry out additional research and close gaps in their knowledge.

PENINGKATAN KUALITAS PEMBELAJARAN PADA POKOK BAHASAN ANALISIS MOLEKUL MENGGUNAKAN INFRA MERAH (IR) DAN NUCLEAR MAGNETIK RESONANCE (NMR) MELALUI PEMANFAATAN PROGRAM HYPERCHEM DAN CHEMOFFICE

Final grades of student who participated in the Course of Instrumental Analytical Chemistry in Odd Semester, Academic Year of 2022/2023 indicate a low student achievement. The objective of this study was to improve the instruction of Instrumental Analytical Chemistry Course by increasing student learning activities and student achievement on the topic of infra red and nuclear magnetic resonance analysis by utilizing HyperChem and ChemOffice Software. Student and lecturer observation sheet were used for measuring student and lecturer activities, respectively while, an essay test sheet was given to measure student cognitive ability. Student and lecturer activity scores for Cycle 1 were 22 and 27, respectively and fell in “Good” category. Student activity score rose up to the maximum score, 27 while, lecturer activity score remained in maximum score in Cycle 2. Lecturer activity already had a maximum score in Cycle 1 because the lecturer was well-prepared in the instruction as well as successful implementation of learning plan. Increasing student achievement was also recorded from Cycle 1 (average 80.2) to Cycle 2 (average 88.5). The percentage of student who gained score above 65 was 93% in Cycle 1 and went up to 100% in Cycle 2. HyperChem and ChemDraw are able to assist the instruction of Instrumental Analytical Chemistry course on the topic of IR and NMR.

PENERAPAN METODE PICTURE AND PICTURE DALAM MENINGKATKAN HASIL BELAJAR PESERTA DIDIK KELAS II PADA MATA PELAJARAN BAHASA INDONESIA

The research was carried out with the aim of improving student learning outcomes in Indonesian language subjects. This research includes Classroom Action Research (PTK) which was carried out in two cycles. Each cycle consists of four stages, namely design, implementation, observation and reflection. The subjects in this research were 22 class IIA students at SDN 238 Palembang. Research data was obtained using teacher and student observation sheets and student test results, then this data was analyzed using a percentage formula. The research results obtained were (1) teacher activity in cycle I using the Picture and Picture method from 80.35% to 92.8% in cycle II, (2) student activity in cycle I using the Picture and Picture 78 method, 57% to 91% in cycle II and (3) the results of learning Indonesian in cycle I using the Picture and Picture method were 63% to 95.45% in cycle II. Based on the results of this research, it can be concluded that by implementing the Picture and Picture model, students' learning outcomes can be more active and teachers' abilities can improve and become better.

Pengembangan Flashcard Edukatif Berbasis Budaya Lokal Bima sebagai Media Belajar Membaca Siswa Sekolah Dasar

Penelitian ini bertujuan untuk meningkatkan kemampuan mengenal dan membedakan huruf “b” dengan “d” “f” dengan “v”, mengeja atau menggabungkan suku kata, serta membaca kata dengan lancar, Penelitian ini menggunakan jenis penelitian dan pengembangan (R&D) dengan model ADDIE yang terdiri dari lima langkah; analisis, desain, mengembangkan, menerapkan, evaluasi. Media flashcard edukatif berbasis budaya local Bima ini dilaksanakan selama 3 pertemuan. rancangan pengembangan media permainan flashcard edukatif berbasis budaya local Bima pada perserta didik dilakukan seperti pengembangan program semester, rencana pelaksanaan pembelajaran mingguan, rencana pelaksanaan pembelajaran serta format penilaian sehingga dihasilkan pengembangan media permainan Flashcard edukatif berbasis budaya local Bima pada peserta didik klas 1 SDN 13 Woja. Media flashcard edukatif berbasis budaya local sebagai media belajar membaca menunjukkan kriteria efektif. Hal ini dapat dilihat dari hasil analisi lembar pengamatan aktifitas guru dan perseta didik diperoleh kriteria berkembang sesuai harapan (BSH), serta hasil analisis angket respon guru menunjukkan kriteria sangat baik. Sehingga dalam hal ini pengembangan media flashcard edukatid berbasis budaya local Bima sangat efektif digunakan dalam pembelajaran pada peserta didik kelas 1 SDN 13 Woja.

The Effect of the Group Investigation Learning Model Assisted by Digital Mind Map (GI-DMM) on the Learning Outcomes Students in the Affective Domain

The learning process carried out by teachers does not actively involve students, this is because the learning models and media applied by teachers have not been implemented optimally. Based on these problems, the right solution is needed by applying a learning model that can activate students. One of them is by applying the Group Investigation learning model assisted by Digital Mind Map (GI-DMM). The aim of the research was to find out the effect the Group Investigation model learning assisted by Digital Mind Map (GI-DMM) to the learning outcomes of students' affective domains. This research method is a true experiment with a Randomized Control Group Posttest Only Design research design. The population in this study were all of class X IPA. Sampling was carried out by purposive sampling technique by means of a lot system, experimental class and control class. The research instrument for the affective domain was in the form of observation sheets for students' attitudes during the learning process. Data analysis techniques used hypothesis testing (t-test). The results of the study in the affective domain of the experimental class obtained an average value of 93.00 and that of the control class was 88.53. Thus it can be concluded that through the application of the Digital Mind Map-assisted Group Investigation Model (GI-DMM) it can improve learning outcomes in the affective domain of students.

Enhancing Science Learning Outcomes through Quantum Teaching Method at Grade VI Students of SD Negeri 11 Koto Salak

The condition of mathematics learning to date is still dominated by teachers as providers of knowledge, resulting in students getting more information from teacher explanations alone, resulting in students' thinking being less developed. The impact of this learning is that mathematics learning outcomes are not optimal. Question Students Have is a strategy that encourages students to dare to ask questions in written form. The aim of this research is to determine the learning outcomes of students taught using the Question Students Have strategy for Class VI students at SDN 11 Koto Salak. The type of research used in this research is experimental research, namely Pre Experimental with a One Group Pre-test and Post-test research design. The sample for this research was 23 Class VI students at SDN 11 Koto Baru, Dharmasraya Regency. The research instruments used in this research were student learning outcomes tests, documentation and observation sheets. The data analysis technique used is descriptive statistical analysis with the PTK cycle. The research results show an increase in student learning outcomes in mathematics lessons seen from the class average score. The value before intervention was 39.78%. The value in cycle I increased to 67.82% and there was another increase in cycle II to 82.40%. Based on these results, it is concluded that the Question Students Have strategy can improve mathematics learning outcomes for class VI students at SDN 11 Koto Salak.

Model PBL Sebagai Upaya Meningkatkan Bernalar Kritis Materi Liturgia Fase E SMKN-1 Muara Teweh

The purpose of the research is to improve the students’ activeness in developing their critical thinking, in the field of Catholic Education and Character in Vocational High School 1 Muara Teweh which uses Problem Based Learning. The research is done in two cycles which include the stages of planning, implementation, evaluation, and reflection. Moreover, the subject of the research is the students of phase F, grade XI with the subject of Catholic Education and Character. Then, the instruments of the research are observation sheet of students’ activities, students’ academic achievement test, and students’ questionnaires. Finally, the research shows that the implementation of Problem Based Learning can improve students’ learning activities and the result of learning in the case of Liturgia. At the end of teaching learning process, students’ activities increase 15%. Furthermore, the result of survey also shows that the students have positive feedback in implementing Problem Based Learning. Therefore, it can be concluded that Problem Based Learning is effective to be used to improve students’ learning activities and the result of learning in the subject of Catholic Education and Character.

Efforts to Improve History Learning Outcomes by Using Creative and Productive Learning Models

Purpose of the study: The aim of this research is to determine students' history learning outcomes by applying creative and productive learning models.
 Methodology: This research is classroom action research carried out in two cycles. Each cycle consists of four stages, namely planning, action, observation, reflection. The research subjects were class X high school students. The data collection tools or instruments used in this classroom action research are written test or evaluation instruments to reveal student learning outcomes and observation sheets regarding understanding of student activities and teacher performance. Data analysis is carried out statistically by calculating the average value obtained then the second stage calculate learning completeness.
 Main Findings: The learning outcomes obtained by students in cycle I showed an improvement compared to before they were given learning using creative and productive models. In cycle II, student learning outcomes showed a better improvement compared to cycle I. Student learning outcomes in cycle II were as follows: the percentage of completion level in cycle II was 84.61%, while students who did not complete the percentage were 15.38. %. So the overall class average is 7.82. The conclusion of this research is that by using the Creative and Productive Learning model there is an increase in learning outcomes on the subject of the origins and distribution of humans in the Indonesian Archipelago.
 Novelty/Originality of this study: The novelty of this research is that it is useful in the field of education, especially in history subjects as an effort to improve the completeness of student learning outcomes.

PENGGUNAAN MEDIA PEMBELAJARAN SEDOTAN (DRINGKING STRAWS) DAN KANTONG DALAM MENINGKATKAN HASIL BELAJAR

In learning mathematics, teachers only use book media and lecture methods, namely the teacher explains then students take notes. Especially in the numerical material, the teacher has not used the maximum learning media, therefore making students unable to understand the numerical material as a whole. As for this research, formulating the problem "The use of media straws (Drinking Strawss) and number bags in improving mathematics learning outcomes in class IV UPTD SDN 104 Inpres Makkaraeng This type of research is a class action research (PTK). This class action research is an observation of learning activities in the form of an action, which is deliberately raised and occurs in a class together. The action is given by the teacher or with direction from the teacher carried out by students. During the implementation of cycle 2, observations on students were carried out using a previously prepared format or student observation sheet, which aims to determine the extent to which the Numbers Bag media can improve student learning outcomes. Reflection, At this stage of cycle 1, there were several students whose scores were still below the KKM, because students also did not fully understand the media directly exemplified by the researcher. In cycle 2, student learning outcomes have improved better than in cycle 1. This can be seen from the results of the post-test given as a benchmark for assessing the final results of the application of the number bag media on the learning outcomes of grade IV students. It is concluded that the use of straw media in mathematics learning can improve the learning outcomes of grade IV students of UPT SDN No.141 Makkaraeng. This is evidenced by the activities of grade IV students in learning mathematics using straw media have increased. This can be seen from the percentage of student activity in cycle I of 18,5% and increased by 62% to 81% in cycle II (3) the learning outcomes of grade IV students at UPT SDN No. 141 Inpres Makkaraeng on mathematics learning have increased from cycle I and cycle II. In cycle II, student learning outcomes have reached the success indicator.

Implementation of the Project Based Learning (PjBL) Learning Model to Increase Student Learning Activeness in Civics Class XI MAN 1 Deli Serdang Academic Year 2022/2023

This research aims to determine the application of the Project Based Learning (PjBL) learning model to increase student learning activity in the PPKn class XI MAN 1 Deli Serdang academic year 2022/2023. This type of research is Classroom Action Research (PTK) which consists of two cycles with Kemmis and Mc Taggart research designs. The action research flow consists of four stages, namely planning, action, observation, and reflection. The research subjects were 35 students in class XI MAN 1 Deli Serdang with a composition of 20 female students and 15 male students. To obtain this field data, the author used data collection techniques in the form of observation, interviews and documentation. The results of this research show that the application of the Project Based Learning (PjBL) learning model can increase student learning activity in class XI PPKn subjects at MAN 1 Deli Serdang for the 2022/2023 academic year. What can be seen from the results of the teacher observation sheet in cycle I only reached 55% and the results of the student observation sheet reached 51.4%, which was in the less active category. In cycle II, the results of the teacher observation sheet had reached 82.5% and the results of the student observation sheet had reached 82.8%, falling into the very active category and had met the criteria for successful action. Based on the research results, it can be concluded that using the Project Based Learning (PjBL) learning model can increase student learning activity in class XI PPKn subjects at MAN 1 Deli Serdang for the 2022/2023 academic year.

Implementation of Guided Inquiry Learning with a Scientific Approach to Improve Class VII Middle School Students' Science Process Skills on Density Material

This research aims to look at the implementation of learning using the guided inquiry model using a scientific approach in one of the classes at Al Azhar 3 Bintaro Islamic Middle School. Apart from that, this research also aims to see the improvement in junior high school students' science process skills after implementing the guided inquiry learning model. This research is Classroom Action Research (PTK) with 2 cycles. Each cycle consists of planning, implementing actions, observing and reflecting. The instruments used consisted of essay questions, e-LKPD, student observation sheets, observation sheets on the implementation of learning using guided inquiry, and practical video assessment rubrics that students created as a form of communicating the results of the investigation, which were then uploaded to social media. The research results showed that after implementing the guided inquiry learning model, all indicators of students' process skills experienced an average increase of 16%.

The Effect of Practicum Tools with Differentiated Learning Strategies on Student Learning Outcomes

This study aims to determine the effect of using practicum tools with diferentiated learning strategies on student learning outcomes. The research method used is quasi-experimental design. The population in this study was all of class X MIA, totaling 212 students, of SMA Negeri 8 Medan. The research sampling technique is purposive sampling technique. Non-equivalent control group design is the type of the research design. The sample in the study consisted of an experimental class, namely class X MIA 6, and a control class, namely class X MIA 5. The experimental class was treated with differentiated learning strategies, while the control class was treated with conventional learning. The research instruments used were multiple-choice questions and student observation sheets. The average score of the posttest for the experimental class was 76.28 with a standard deviation of 6.9, and that of the control class was 72.08 with a standard deviation of 6.7. The pretest and posttest data obtained have been analyzed and met the prerequisites for testing the hypothesis, namely, the data is normally distributed and is homogeneous. The result of the right-tailed t-test on the hypothesis obtained the value of tcount > ttable, namely 2.608 > 2.002 whit = 0.05. Based on the testing criteria, the accepted hypothesis is H, which means that there is an effect of the treatment that is the use of practicum tool with different learning strategies on student learning outcomes at SMA Negeri 8 Medan for the 2022/2023 academic year. The result of the simple linear regression equation is Y = 65.9 + 0.34X.

Improving Passing Learning Outcomes for Mentally Disabled Children through Command Learning Methods in Football Games

The low learning outcomes for passing in class body weight position is not forward. The aim of this research is to find out whether the use of the command learning method can improve the learning outcomes of basic passing techniques for mentally retarded children. The population and sample in this study were students with intellectual disabilities in class X SMALB, totaling 4 students. This research is Classroom Action Research. The data collection techniques used were performance tests, student and teacher observation sheets. Data were analyzed by exposure between cycles. Based on the initial data results, the average student score was 65.25. Learning improvements in cycle I, the average student score rose to 75.5 or 10.25%. Learning improvements in cycle II saw an increase in the average student score by 81 or an increase of 5.5%. The research results in cycle II showed that there was a significant increase in classical completeness compared to cycle I with scores having reached the Minimum Completeness Criteria (KKM 75).

Improving Mathematics Learning Outcomes Through Contextual Teaching Learning (CTL) Models with Auxiliary Objects of the Surrounding Environment at Madigondo Samigaluh Public Elementary School, Kulon Progo Regency, 2021/2022 Academic Year

This research was conducted to improve mathematics learning outcomes in the 2019 Coronavirus Disease (Covid-19) pandemic era through face-to-face meetings, increase student motivation in learning and improve teachers' abilities in carrying out teaching and learning activities. This type of research is Classroom Action Research (CAR). The subjects of this study were all fifth-grade students at SD Negeri Madigondo Kapanewon Samigaluh for the 2021/2022 academic year, with a total of 14 students consisting of 9 boys and 5 girls. The object of research is solving problems related to learning mathematics by using the CTL learning model to increase student motivation and achievement as well as teaching abilities in teaching and learning activities. The data collection technique in this study used the evaluation of student test assessments and observation sheets. The results showed that there was an increase in students' mathematics learning outcomes through the CTL learning model, namely in cycle I for 1st meeting of 55.56% in the "very low" category, and in 2nd meeting, the percentage of learning completeness was obtained by 66.67% in the "low" category, while in cycle II for 1st meeting percentage of 77.78% category "Enough" and at 2nd meeting obtained a percentage of 100%. The results showed that there was an increase in the learning motivation of fifth-grade students at SD Negeri Madigondo Kapanewon Samigaluh, namely in cycle I for the 1st meeting obtained a percentage of 49.39%, and the 2nd meeting obtained a percentage of 70.31%. While in cycle II for 1st meeting obtained a percentage of 84.60%, and the second meeting obtained a percentage of 92.70%. The results showed an increase in the current teacher's ability (KBM), that is, in cycle I a presentation of 89.68% was obtained with a conversion of 4 "Very Satisfactory" values, while in cycle II a percentage of 95.91% was obtained with a conversion of 4 "Very Satisfactory" values.

PENINGKATAN SELF CONFIDENCE DAN KEMAMPUAN KOMUNIKASI MATEMATIS SISWA MELALUI MODEL PEMBELAJARAN KOOPERATIF TIPE TIME TOKEN

This research was conducted because of the low self-confidence and mathematical communication skills of class VII students, especially in statistics. This is because Daarul Ukhuwwah Middle School has its own curriculum and there is no statistics material. Therefore, students do not have the courage to express their ideas or opinions. So, to increase self-confidence and mathematical communication skills of female students, researchers use cooperative learning with the time token method. The purpose of this study is to find out the description of the application of the time token type of cooperative learning to increase students' self-confidence and mathematical communication on set material in class VII SMP Daarul Ukhuwwah 2 Singosari Malang. The type of research used in this research is classroom action research (CAR). The subjects of this study were class VII-B students of SMP Daarul Ukhuwwah 2 Singosari for the 2022/2023 academic year consisting of 31 students. The data collection instruments used in this study were student observation sheets, questionnaires, and tests. This research was conducted in 1 cycle consisting of 2 meetings. The stages carried out in each cycle are planning, action, observation, and reflection. The results of this study indicate an increase in self-confidence and students' mathematical communication skills at each meeting. The average result of the questionnaire was 47.42% before the action became 69.50% in the first cycle of the 1st meeting to 83.23% in the 2nd meeting of the first cycle and from the average results of the test, namely 52.21% to 71, 60% in the first cycle of the 1st meeting to 86.45% in the 1st cycle of the 2nd meeting.

APPLICATION OF THE PROBLEM BASED INSTRUCTION (PBI) LEARNING MODEL ON TUBE MATERIALS TO IMPROVE STUDENT LEARNING OUTCOMES

This research aims 1) to describe tube learning by applying the Problem Based Instruction (PBI) learning model, 2) to describe improving student learning outcomes through implementing the Problem Based Instruction (PBI) learning model. This research is Classroom Action Research (PTK). The instruments used are (a) Teacher (Researcher) and Student Observation Sheets, (b) Interview Guide Sheets, (c) Documentation, (d) Field Notes, (e) Learning Results Tests. The research subjects were class IX students at SMP Swatsta Imanuel Bekasi with a total of 20 students. The research results obtained show that the Problem Based Instruction (PBI) learning model can improve student learning outcomes, especially in tube material. This is because by implementing the Problem Based Instruction (PBI) learning model students are more active in learning, understand the concept of the material better, are able to solve mathematical problems, students' analytical power towards mathematical problems increases, they are more critical in solving problems and the group learning carried out makes Students are more open in expressing their ideas. Based on the results of this research, it can be concluded that using the Problem Based Instruction (PBI) learning model can improve student learning outcomes, especially in tube material. The Problem Based Instruction (PBI) learning model should be used as an alternative in improving student learning outcomes in mathematics learning.

PENDEKATAN STM DALAM PEMBELAJARAN IPA UNTUK MENINGKATKAN KARAKTER PEDULI LINGKUNGAN PADA SISWAKELAS 6 SD NEGERI 1 MIRICINDE

This best practice aims to convey the author's experience in using the STM approach in science learning to improve the character of environmental care in grade 6 students of SD Negeri 1 Miricinde. Strengthening character education caring for the environment in students needs to be developed from an early age, because now we are in the era of revolution 4.0. This digital era makes students increasingly indifferent to their environment. This also happened to 29 grade 6 students of SDN 1 Miricinde. Students are still wasting on the use of electrical energy, students still do not care about closing open faucets even though the tub is fully charged, advice and appeals from principals and teachers are not heeded by students. Students do not yet understand the importance of caring for the environment. The instruments used are observation sheets of students' environmental care attitudes, observation sheets of teacher activities in applying the STM approach, observation sheets of teachers' roles in instilling environmental care attitudes, and questionnaires of students' environmental care attitudes. The validity of the instrument uses expert judgment, namely the principal. Based on the overall results of observations and analysis of existing data, it can be concluded that the STM approach in science learning can improve the character of environmental care in grade 6 students of SD Negeri 1 Miricinde. Student learning outcomes have also improved. In addition to improving the character of caring for the environment, the STM approach in science learning can also increase the character of nationalism in students. The impact of implementing the STM approach for schools is that there is a decrease in electricity bills in schools.

Implementation of the PBL-STEM Model to Improve Students' Critical Thinking on Reaction Rate Material

The application of PBL-STEM can encourage students to be independent in the learning process and emphasize the process of thinking critically and analytically to seek and find answers to a problem in question. This study used a true–experimental design with the Posttest Only Control Design type. The population in this study were all students of class XI SMA Kristen Sunodia Samarinda for the academic year 2022/2023 divided into 2 classes. This study aims to determine the effect of PBL-STEM in improving students' critical thinking skills. Sampling was done by cluster random sampling technique. The instruments used to measure students' critical thinking skills in chemistry were post-test questions, teacher and student observation sheets, and student response sheets (questionnaire). Data analysis was performed by t-test. The results of the t-test with Mann-Whitney obtained sig. (2-tailed) in both classes is 0.00 <0.05, it is concluded that Ha accepted the statement that there is an effect of the application of PBL-STEM on the critical thinking skills of class XI students at Christian Senior High School Sunodia Samarinda regarding reaction rates. The results of the teacher and student activity sheets in the experimental class were both in very good categories, as well as the student response to PBL-STEM learning, namely 77.2% of students agreed with the application of PBL-STEM in learning which can train students' critical thinking skills. This research discusses the analysis of how effective the influence of PBL and STEM integration is to improve critical thinking skills on reaction rate material so that this research can be used as a reference for applying PBL-STEM to other chemistry topics.