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The purpose of this research is to reanalyze the influence of the learning model in an effort to improve the ability to understand mathematical concepts. After that, the analysis results are combined and a conclusion about the overall problem is obtained. The method in this research is the Systematic Literature Review (SLR). This research seeks, observes, evaluates, and describes the available research based on relevant phenomena and specific research questions. The SLR method reviews and identifies journals according to the established procedures. Data collection comes from journals indexed by Sinta and Google Scholar over the past 6 years. The keywords for the search are "Understanding Concept Mathematics Ability" and "Learning Model." From the search, 23 articles that meet the criteria were obtained. The obtained data set was then analyzed as research findings using qualitative and quantitative analysis. Based on the results and discussion, it was found that students' ability to understand concepts can be influenced by the application of learning models.

The importance of mastering mathematical communication skills and independent learning in the 21st century. This research finds out whether learning independence affects mathematical communication skills. This research uses a literature study methodology or Systematic Literature Review (SLR). This research collects data by taking data from literary sources, reading, taking notes, and processing these sources as research material The research analyzed 35 articles that had been accredited in the literature review obtained from Google Scholar, Research Gate, Publish or Perish, Taylor & Francis, Science Direct, and DOAJ. The results of this research are that soft skills can influence hard skills, namely learning independence can influence mathematical communication skills which have an impact on improving student learning outcomes.

Dyscalculia is a specific learning condition that affects the comprehension and manipulation of numerical concepts, which can impact students' academic performance and well-being in mathematics education. The research methodology used was a systematic literature review that aimed to identify and synthesize the existing evidence regarding the differences in understanding of dyscalculia, its characteristics and the difficulties that students with dyscalculia may face in class. The search string used in electronic databases, such as Crossref and Google Scholar, to generate articles for the review were “dyscalculia” and “dyscalculia characteristics.” After the study selection process and appraising its quality, 23 articles met the selection criteria and were reviewed to synthesize answers to the research questions. The findings suggest despite many differences in understanding what dyscalculia was and it was clear that dyscalculia is a specific learning condition that affected students’ comprehension and manipulation of numerical concepts. Students with dyscalculia exhibit various characteristics, the most noticeable of which was low mathematics achievement scores. The difficulties faced by students with dyscalculia in the classroom were numerous. However, the primary obstacles they faced involved comprehending and applying mathematical concepts, as these difficulties could lead to others, such as executing mathematical problem-solving instructions. Educators might comprehend the diverse characteristics of dyscalculia to provide appropriate support and accommodations for students with difficulties.

Penelitian ini bertujuan untuk mengetahui proses mengembangkan, kelayakan menurut ahli materi dan bahasa serta ahli media, dan hasil uji coba penggunaan LKPD digital materi lingkaran dengan pendekatan PMRI berbasis HOTS untuk peserta didik kelas VIII SMP Strada Budi Luhur Bekasi. Penelitian ini termasuk penelitian Research and Development menggunakan model Borg and Gall dengan lima langkah utama, yaitu analisis kebutuhan, pengembangan produk, uji validasi ahli dan revisi, uji coba lapangan kelompok kecil dan revisi, serta uji coba lapangan kelompok besar dan produk akhir. Subjek uji coba lapangan adalah peserta didik kelas VIII SMP Strada Budi Luhur Bekasi. Instrumen penilaian yang digunakan berupa instrumen validasi dan angket. Teknik analisis data menggunakan analisis data kuantitatif dan kualitatif. Hasil penelitian ini menunjukkan bahwa produk LKPD digital materi lingkaran yang dikembangkan layak digunakan untuk peserta didik kelas VIII SMP. Hal ini ditunjukkan dengan penilaian LKPD digital materi lingkaran yang mendapat kategori “Baik Sekali” dengan persentase dari ahli materi dan bahasa sebesar 83,24%, ahli media sebesar 93,5%, guru sebesar 91,62%, dan peserta didik dalam uji coba lapangan kelompok kecil dan besar sebesar 84,19% dan 83,80%. This research aims to determine the process of developing, the feasibility according to material and language experts as well as media experts, and the results of testing the use of digital student worksheets (LKPD) with circle materials using PMRI approach based on HOTS for eighth-grade students of Strada Budi Luhur Bekasi junior high school. This research belongs to Research and Development using the Borg and Gall model with five main steps: needs analysis, product development, expert validation tests and revisions, small group field trials and revisions, and large group field trials until becomes a final product. The subjects of the field trials were eighth-grade students of Strada Budi Luhur Bekasi junior high school. The assessment instruments used were in the form of validation instruments and questionnaires. The data analysis technique used quantitative and qualitative data analysis. This study indicates that the digital student worksheets product developed with circle materials is suitable for use of eighth-grade students. This is indicated by the assessment of the digital student worksheets with circle materials which gets the "Excellent" category from material and language experts with 83,24%, media experts with 93,5%, teacher with 91,62%, and students in the small and large group field trial with 84,19% and 83,80%.

The quality of education must be improved in order to create quality education. The Covid-19 virus that has infected most Indonesians since early March 2020 has impacted all areas of community movement. Restrictions on personal activities until the Implementation of Community Activity Restrictions (PPKM) began to be enforced. Physical distancing is one of the efforts made to limit community interaction. The government also decided to disburse students and shift schools' teaching and learning process to at home. Distance learning or online learning requires all school residents to work more actively in teaching and learning activities. The ability to understand concepts is one of the skills that are expected to be achieved in mathematics subjects. This study aims to determine the application of learning with the PMRI Approach assisted by the Smart Classroom application in improving the ability to understand the concept of building a classroom for grade V students of SDN Jakamulya III Bekasi City. This research was conducted quantitatively with 6 subjects as the object of study. The results of the study show that there is an increase in mathematics learning with the PMRI approach with the help of the Smart Classroom application. The results showed that the PMRI approach assisted by the Smart Classroom application for mathematics subjects in grade V elementary schools could help students understand the concept of building spaces. This is shown by the increase in positive responses from the start of cycles I, II, and III in scoring and interviews. Students are happy and facilitate learning through the Smart Classroom app. Moreover, there are online and offline learning systems and hybrid learning.

This study aims to describe the types of mistake and causes of the XI grade students of SMA Negeri 31 Jakarta TP. 2019/2020 made a mistake in solving the problem of an algebraic function derivative application. The method of this research is a qualitative descriptive study. The data was obtained by conducting tests and interview online. The respondents were drawn from 6 XI class in SMA Negeri 31 Jakarta. Each student's work was analyzed to describe the types of mistakes using the Newman analysis procedure, then an interview was conducted to describe the factors that caused students to make mistakes. Based on the results of the study, it can be concluded that the types of mistakes found when students solve problems in the application of algebraic function derivatives are 1) reading mistakes, that is, incorrectly writing the functions listed in the questions, 2) mistakes in understanding, in the form of misinterpreting what is known and asked about, 3) transformation mistakes, in the form of students' inability to choose procedures to solve problems appropriately, 4) process skill mistakes, in the form of incomplete student work, miscalculation, 5) conditioning mistakes, in the form of students' inability to show the final answer. The contributing factors are that students do not understand the derivative application material of algebraic functions, students are in a hurry to solve the problems, different types of questions given are different from the questions exemplified by the teacher, and rarely make conclusions at the end of the answer. Keywords: analysis of mistakes, newman procedure, application of derivative algebraic functions.