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This study aims to obtain teaching materials based on a valid, practical, and effective realistic mathematical approach, so as to improve students' mathematical reasoning abilities on the material of a three-variable linear equation system. The research instruments used were questionnaire validation sheets, lesson plans validation sheets, teaching material validation sheets, test instrument validation sheets, mathematical reasoning ability tests, and teacher and student response questionnaires to teaching materials. After all instruments, lesson plans, and teaching materials were declared valid by the validator, then readability tests and field trials were carried out. The results showed that: (1) the teaching materials based on the realistic mathematical approach developed had met the criteria of validity based on the validator's assessment with the average validity of the teaching materials for the material being 3.13 and 3.29 for media with a very feasible category; (2) the teaching materials based on the realistic mathematical approach that have been developed have met the practicality criteria through: a) the results of the questionnaire student responses to teaching materials show the percentage of practicality of 81.19% with a very practical category, b) the results of the questionnaire responses of teachers to teaching materials show the percentage of practicality 88.75% with very practical category; (3) The teaching materials based on the realistic mathematics approach developed meet the effective criteria with: a) classical student learning mastery of 88%, b) more than 65% of students have achieved 75% of learning objectives for each indicator, c) increased mathematical reasoning ability students after using teaching materials seen through the average score of students increased from 50 in the pretest to 85.33 in the posttest and the results of the N-Gain analysis which showed students' mathematical problem solving abilities increased by 0.712, meaning in the high category.

This study aims to find out that studying literature can effectively improve students' mathematics learning achievement with the STAD type cooperative learning model.  The type of research used is research with a qualitative approach.  Qualitative research uses descriptive or verbal data from people who have observed a behavior.  The method used is literature study.  Literature study is an activity that is closely related to the method of collecting library data, reading and taking notes as well as processing research materials.  The type of data used is secondary data.  Secondary data is data that already exists, so we just need to find and collect existing data.  The secondary data source used in this research is student learning outcomes with the STAD type cooperative learning model.  From the search results, the researchers found 7 journals relevant to the research topic.  From the journal it was found that there was an increase in student learning outcomes using the STAD type cooperative learning model.

This research aims to find out the results of research analysis of students abilities through the Two Stay Two Stray (TSTS) type cooperative learning model from various literature, as well as to analyze the difficulties of students mathematical communication skills through the Two Stay Two Stray model. This type of research is descriptive qualitative and uses a literature study research method which was carried out at the Digital Library, Medan State University in July – September 2022. The instrument in this study was the author himself. The steps of this research are: (1) Designing the research. (2) Carry out the research design. (3) Analyze and provide conclusions on the results of the analysis. The analysis technique used in the selection of information related to data analysis techniques is the Miles and Huberman analysis technique. The data source used secondary data consisting of 5 journals. The conclusions of the results of this study show that: (1) The average results of tests of students mathematical communication abilities through the application of the TSTS model are: (a) The indicator of mathematical representation is 51.93%, (b) The indicator of writing/explaining mathematics was 40.31%, (c) The indicators describe is 37.94%. (2) There are several difficulties experienced by students and teachers are: (a) Students have difficulty connecting real objects, pictures, and diagrams into mathematical models, (b) Students lack confidence in communicating arguments and ideas in mathematical problems, ( c) Students are less thorough in working on questions, (d) Students have difficulty expressing mathematical ideas in the form of graphs, pictures, or tables, (e) Low student skills in understanding mathematical communication problems and drawing conclusions about mathematical communication problems, (f ) The role of the teacher is less than optimal in carrying out learning activities.

Background: Adolescent problems are things that should be highlighted at this time, this is because youth is a transitional period that will cause various problems. According to the BKKBN (2012) the problems that stand out among adolescents are issues around the Adolescent Reproductive Health Triad (KRR), namely sexuality, HIV/AIDS and drugs. The results of the 2012 Indonesian Demographic Health Survey (IDHS) for Adolescent Reproductive Health (KRR) showed that 9.3% of adolescents stated that they had had premarital sex. Based on data from the National Narcotics Agency (BNN) in 2014, 27.32% of students were drug users. The low knowledge of adolescents about reproductive health is inadequate which can be seen by only 35.3% of young women and 31.2% of young men aged 15-19 years knowing that a woman can get pregnant with one sexual intercourse. Adolescents' knowledge of sexually transmitted infections (STIs) is still low where only 35% of women and 19% of men know gonorrhea, 14% of women and 4% of men know about genital herpes while other types of STIs are below 1%.

For students in primary schools, there are still numerous nutritional issues to be solved. There has been an increase in the prevalence of overweight and underweight children in the Malang City area, particularly in the Puskesmas Mojolangu working area. One location where these dietary issues occur is SDN Tasikmadu 1. This is a result of the absence of educational resources for understanding balanced nutrition. The goal of this study is to create a balanced nutrition four card instructional media and evaluate its viability and efficacy as a tool for balanced nutrition education. The study follows the define, design, create, and disseminate framework while using a research and development approach. Due diligence was performed by media and material experts utilizing the BNSP evaluation tool with an average score of 87.50%. The effectiveness test was carried out at SDN Tasikmadu 1 on 30 students using pre-test and post-test instruments. Analysis using paired t-test showed that the tool and its accompanying materials were declared "appropriate" and provision of Balanced Nutrition Quartet Card media was effective in increasing students' knowledge, with an average pre-test score of 55.06 and an average post-test score 87.73 and the result of the paired t-test is P=0.000.

This study aims to determine the effect of investment motivation and financial literacy on investment interest. The method used through a quantitative approach. This study used a population of students from the Faculty of Economics and Islamic Business at the State Islamic University of North Sumatra class of 2019 with a sample of 51 students. The results show that partially the investment motivation variable has no effect on investment intention, while the financial literacy variable has a positive and significant relationship to investment interest. Simultaneously there is an influence between investment motivation and financial literacy variables on investment interest. Furthermore, the value of the coefficient of determination shows 74.7%

The ability of students in writing skills still experiences errors in the use of letters, especially in the use of capital letters. This study aims to determine errors in the use of capital letters written by students in the form of descriptive paragraphs at UPT SD Negeri 71 Gresik through qualitative research methods. Research subjects consisted of 10 students of class IV. Data collection was obtained from observation and tests, with a triangulation collection technique. The results of the study of 10 students who wrote descritive paragraphs with five aspects of the intended indicators were 5 students with errors in the first letter of the beginning of the sentence, 4 students with errors in the first letter of the persons name, 6 students with errors in the letters first the name of the day and month, 4 students with errors on the first letter of the place name, and 3 students with errors on the first letter of the essay title. With the analysis of errors in the use of capital letters in descriptive paragraphs, it is hoped that students will be able to broaden their vocabulary and create written works that have good grammer.    

School facilities are a very important tool in supporting learning in schools. Facilities will be needed by teachers and students in teaching and learning because the facilities will increase students' learning motivation, with complete facilities will also support the performance of teachers in delivering material to students. The purpose of this study is to observe school facilities, especially MTS Ali Imron and see the effect of students' learning if the school facilities are inadequate, especially in English subjects. The case study in this study was conducted at MTS Ali Imron Medan. The method in this study uses a qualitative method by observing schools and conducting interviews with English teachers at MTS Ali Imron Medan.

This study aims to determine the interest and quality of the English teaching and learning process of students, especially in listening skills.  Knowing interests is carried out through the use of audio-visual media with role-playing methods that are expected to provide opportunities for the creation of pleasant learning conditions.  Thisclass obtained optimal results where students who were interested in taking English lessons could increase significantly. This research is in the form of Class Action Research  which is carried out using VCD media, which consists of four stages: planning, implementing actions, observation, and reflection. Actions can be done by applying learning with audio-visual media and continued with role-playing methods. This research was conducted on 11 students of class X 1 SMKS Generus Bangsa. Responses to the progress of student interest are obtained from the results of student questionnaires, student interviews, student learning logs, observations, interviews between teachers, teacher journals, daily test results and assignments. Instrument validation is carried out with critical reflection between research teachers and face validity. Data validation is carried out by triangulating observations from the aspects of students, teachers and partner teachers. The results of each cycle reflection are used to plan further steps.

This research targets to enhance pupil’s capability in reading comprehension so that the scholars are able to apprehend studying texts from books or other analyzing media. The pattern of this studies became students of eighth (2) Grade MTs Laboratorium Uinsu. This studies uses a qualitative and quantitative strategies. The research used observations and questionnaires because the device. The consequences of this look at suggest that the capability of the 8th (8) grade students of MTs Laboratorium Uinsu is pretty awful, they are very hard to recognize antonyms and synonyms of a word due to the lack of vocabulary they have got.

This research can be conducted on the number of customers who visit Angkringan CA Gading Serpong by using various kinds of social media so that this form of purchase decision becomes evidence from customers who are interested in buying Nasi Kucing products. Likewise, it is important for Angkringan CA Gading Serpong to use digital marketing, because social media has a strong influence on promoting the product. Analysis can be carried out using quantitative research methods, because this research will discuss the 4P strategy, namely Product, Price, Place and Promotion which will be part of the four main keys to making a marketing strategy for Nasi Kucing which will be sold by Angkringan CA Gading Serpong. In terms of target customers, the average consumer who eats at this angkringan is students because access to this angkringan is not far from the university. This study has twenty kinds of indicators consisting of Product Quality, Product Design, Product Brand, Product Variants, Affordable Prices, Sales Competitiveness, Price Compatibility, Strategic Location, Affordable and Convenient, Order System more regularly, Media Promotion, Communication, Product Introduction , Advertising intensity through Food Blogger, so that the stability of a product is proven to satisfy customers and become loyal, a questionnaire needs to be made with a target of reaching 110 respondents who are customers of Angkringan CA Gading Serpong. This is a form of participation in filling out the questionnaire.

This study aims to determine the impact of full day school on student learning concentration at SMA Negeri 4 Pariaman. This type of research is descriptive qualitative research where researchers use observation and interview methods. It appears that students are not effective in adjusting themselves to extra hours throughout the day. One of them is the lack of school during the day, students are very tired. Schools that carry out full day school programs have an impact on students, namely physical exhaustion, mental fatigue, and emotional exhaustion. Students also feel bored and bored, bored in learning and arise boredom and fatigue resulting in a lack of student learning concentration during the learning process. Students who usually go to school in the afternoon now go home in the afternoon, plus the assignments or homework given by the subject teacher are too excessive, this has an impact on students being unable to concentrate and forget easily. At the beginning of the full day school program at school, many students complained, were tired, several weeks of full day school, many students did not attend due to illness and some were absent without explanation, each class must have been absent every day, more than five people . So the conclusion is that full day school has an impact on student learning concentration at SMA Negeri 4 Pariaman.

This study aims to explore the impact of bullying on student behavior at SMA Negeri 3 Payakumbuh. Verbal bullying is an aggressive act in the form of speech that is done intentionally and repeatedly with the aim of dominating, showing strength, hurting, terrorizing, or just for fun. This research is a qualitative research in the form of descriptive. Data collection techniques used are observation and interviews. The results of the study showed the impact of verbal bullying that occurred at SMA Negeri 3 Payakumbuh on student behavior, namely decreased self-confidence, became gloomy, decreased socialization levels, and decreased academic grades. Verbal bullying occurs during empty class hours, recess hours, sports hours, and school hours. The reason for the perpetrators of verbal bullying is the habit in the place where they come from as normal, they think they are the strongest, they want to be respected, and there is no resistance from the victim.

The background of this research was class VIII MTs Al Washliyah Sei Mencirim  with learning difficulties in following the teaching of mathematics with a scientific approach introduced by Kemendikbud in Curriculum 2013. Such problems made researchers interested in conducting further research. The purpose of this study to determined the cause of students experiencing difficulties in the learning process of mathematics with a scientific approach. This research was a quantitative and qualitative research. Data obtained by observation, questionnaires, and interviews. The research instrument used was a questionnaire teachers and students, learning and activity observation sheet of students in the classroom, as well as interview guides teachers and students. The results showed that the form of learning difficulties for class VIII students that appeared in mathematics learning on flat sided space material with a scientific approach were students having difficulty understanding and solving flat sided space problems, difficulty in asking flat sided shape problems, difficulty in trying to solve problems. in the form of reasoning and difficulties in concluding the material that has been studied. The cause of the emergence of learning difficulties in mathematics learning material relations and presenting the relation with the approach of scientific because of the difficulties caused by teachers such as: (1) the teacher wasn’t directing students to ask and concluded, (2) teachers didn’t prepare the implementation stages observe well with the acquisition of a percentage 40%, (3) the issue of the reasoning given fairly difficult, (4) lack of skills and understanding of teachers in implementing the learning process with the approach of the scientific with the acquisition of a percentage of 40% and the difficulties that arise from the students themselves, such as: (1) lack of awareness of students to learn and willing to follow the learning process, (2) the fear that a dominant appears, (3) students experience language impairments, (4) students impaired recall, (5) students impaired reasoning.

The purpose of this research is to define some deixis and examine how Indonesian students interact. The methodology used in this research is descriptive. The conversation of Indonesian language education students is described in this study using data deixis, which includes persona deixis, place deixis, time deixis, discourse deixis, and social deixis. The primary data source for this research comes from conversations among students of Indonesian language education in both formal and informal contexts. National lectures, conversations with other students, and casual conversations are examples of informal activities. Discussions between students and lecturers are formal activities (in canteens, boarding houses, rice stalls, etc.). Data collection techniques involving recording and wiretapping. Research data analysis was carried out using a descriptive approach. Persona deixis (plural first person singular) is one of the conclusions of the study.

This research is aim to describe the difficulties in learning and solving Algebra problems experienced by class VII Students of SMP Negeri 7 Cimahi. This research method uses a descriptive method with a qualitative approach. The subjects used in this research were five Students of class VII H who were randomly selected, and the teacher concerned. The instrument used in this study were written tests, questionnaires and interview guides. The results of this research indicate the various difficulties experienced by Students and the factors that cause them. These difficulties include difficulties in identifying coefficients, determining like terms, and performing various arithmetic operations in Algebraic forms. The factors that cause Student difficulties are divided into two, namely internal and external factors. The internal factor is that Students don't understand the concept and don't master arithmetic operations on integers, while the external factor is the lack of Interest, talent and motivation of Students in learning Algebra.

This study discusses the application of the Mind Mapping method to PAI learning at SMK Karya Guna 1 Bekasi. The purpose of this study was to find out whether the application of the Mind Mapping method in PAI learning at SMK Karya Guna 1 Bekasi in Class XI was successful or not. The purpose of this research is to prove that by applying the Mind Mapping method to pie learning in schools. By applying the Mind Mapping method it can stimulate students to be active in class, and be able to discuss with peers, and also be able to solve problems by discussing. In this study it can be proven that one of the ways to arouse student activity is to use the Mind Mapping method in teaching PAI at school. Based on the results of this study, it can be seen that applying the Mind Mapping method to PAI learning at SMK Karya Guna 1 Bekasi is well implemented. This can be proven by the application of the Mind Mapping method to PAI learning at SMK Karya Guna 1 Bekasi. Using this method can produce active and critical students in dealing with problems, as well as being able to discuss and respect friends' opinions when discussing, increasing the level of independence in learning. Not only using the discussion method, the teacher must also provide motivation in learning so that students can learn optimally.

This service aims to implement the Focus Group Discussion (FGD) teaching method on PAI material at the high school level. This service uses a qualitative descriptive method which is carried out in class XI, totaling 35 students which is carried out through the preparation, implementation and evaluation stages. The problems faced by students when learning tend to use the lecture method, especially in PAI lessons, students are only listeners without having to express students' opinions, this results in a decrease in student interest and activity when receiving lessons. The results of this service prove that students have empathy during the learning process and can express creativity in explaining material, hone students' confidence in expressing opinions and train students' cohesiveness with other students which makes the method effective. This model can be a stimulus for educators who want to apply the PAI learning method in the classroom.

This study examined the average student mathematics learning outcomes when the Blended Learning Model was applied to learning integer material. The study design used was: Posttest Only Control Group Design. The population in this study was all of class VII at SMP Negeri 6 Tondano. In contrast, the samples in this study were class VII B, with 21 students as the experimental class and class VII A as the control class with 21 students. This study's analysis showed that the experimental class's average posttest score was 84,76, while the average posttest score for the control class was 74,28. The study results were analyzed using the T-test statistic at s significant level of 0,05, namely Tcount = 3,636 > Ttable = 1,725, so that H0 was rejected and H1 was accepted. The Blended Learning Model can improve student learning outcomes based on these results.

Based on observations made at SMA Negeri 1 Gunuang Omeh District, the problem found was the low interest in learning of students in PAI and BP subjects due to the large number of students who did not pay attention to the teacher's explanation, and the lack of use of learning models and media used in learning , one of which is the Problem Based Learning learning model. The role of the learning model is very important, because using visual media will be able to influence students' learning interests. The purpose of this study was to find out the use of the Problem Based Learning learning model in increasing students' learning interest in PAI and BP subjects on Da'wah Strategy and Islamic Development in Indonesia Class XII.MIPA at SMA Negeri 1 Gunuang Omeh District. This type of research is Classroom Action Research (PTK). The process of implementing PTK has four main components, namely planning, action, observation and reflection carried out in 3 cycles. The results of data analysis obtained the percentage of students' learning interest using the Problem Based Learning learning model of 44.83% in cycle I. The process of applying the Problem Based Learning learning model in PAI and BP learning increased in cycle II by 65.52% and 79.31 % in cycle III. So it can be concluded that the implementation of PAI and BP learning by using the Problem Based Learning learning model can increase students' learning interest.