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This research aims to examine whether the achievement and improvement of junior high school students' mathematical communication skills who use the Contextual Teaching and Learning approach through the Numbered Head Together type Cooperative Learning model is better than those who use regular learning. The method used in this research is experimental. This research was conducted at one of the state junior high schools in Cianjur Regency with a population of all class VIII, while the sample was taken from two classes randomly where one class was the experimental class and the other class was the control class. This research instrument is about description. The research data were processed using the Microsoft Office Excel 2007 application and SPSS 16 software. Based on the research results, the author concluded that the achievement and improvement in mathematical communication skills of junior high school students whose learning used the Contextual Teaching and Learning approach through the Numbered Head Together type Cooperative Learning model was better than that using regular learning.    

Mathematics is a scientific field that investigates formless structures and forms of interaction within them. Mathematical interaction is a powerful tool used to express mathematical opinions verbally or in writing. The Think-Talk-Write (TTW) learning approach is designed to facilitate the construction, reflection, and organization of new mathematical views. This study aims to explore the efficacy of using TTW learning examples as a tactic to enhance the quality of students' mathematical communication, and to assess the impact of this approach. In order to achieve these goals, researchers used classroom action research in two stages of testing. The study involved 21 students in grade VIII at SMP Parulian 1 Medan. The initial ability test revealed that the students' mathematical communication ability scores were 34.2%. After conducting test activities in cycle I, the average mathematical communication ability of students rose to 36.8%. In the second cycle (II), the percentage result increased to 88%. The results of the research demonstrate that students in Class VIII at SMP Parulian 1 Medan experience a significant improvement in their mathematical communication skills through learning via the Think-Talk-Write model. We can conclude that this approach is an effective way to enhance students' mathematical communication skills.    

This study aims to determine the application of the Problem Based Learning learning model to mathematical communication skills in terms of independent learning on set material in class VII SMP Negeri 01 Tayan Hulu. The research form used is quasi-experimental designs, with a 2×3 factorial design. The population in this study were students of class VII A and students of class VII B. The sample in this study was one class selected by cluster random sampling. Data collection techniques used are direct communication techniques and measurement techniques with data collection tools in the form of questionnaires and test questions in the form of essays. The data analysis technique used was the analysis of two dissimilar cell paths with the normality test using the Lilifors test, homogeneity using the Bartlett test and continued with the multiple comparison test using the Scheffe method. The results of this study are (1) the mathematical communication of students who follow the problem-based learning model is better than students who follow the conventional learning model, (2) the ability of mathematical communication between students who have high learning independence is better than moderate after the implementation of the model learning problem based learning. (3) students' mathematical communication skills in the moderate learning independence category were better than students in the low learning independence category after applying the problem-based learning model. (4) at the level of independent learning, problem-based learning models provide better mathematical communication skills than conventional learning models.    

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.