Individuals attempting to study remotely during the COVID-19 lockdown will find that blended learning is a helpful solution and results in a significant increase in learning engagement. The best benefits for teachers and students are obtained by maximizing the advantages of each teaching method and by combining the advantages of online and face-to-face instruction. The study aims to investigate the effectiveness of the flex model of blended learning in teaching the mathematics subtopic of coordinates in the plane through the improvement of students' academic achievement, self-study skills and learning attitudes. A quasi-experiment was conducted to compare the academic achievement, self-study skills and learning attitudes of 46 students in the control class who used traditional methods to those of 44 students in the experimental group who used the blended learning model. The pre-and post-test results, observations, and student opinion survey were used to compile data, which were then analyzed quantitatively (with SPSS) and qualitatively. The study confirmed that blended learning positively impacts students' academic achievement in the experimental class compared with the control class (Sig (2-tailed) = 0.001 and SMD = 0.6717), as demonstrated by the outcomes of the independent t-test analysis of the two groups in the post-test phase. In addition, observations and student opinion survey results also indicated that blended learning increased student interactions with teachers and improved students' academic achievement, self-study abilities and learning attitudes. Due to time constraints, not all the students who participated in the experiment could make progress. On the other hand, the study's relatively small sample size gave the impression that the results were only partially representative of the population. As a result, additional studies focusing on improving the effectiveness of teaching and learning within different blended learning models, broadening the scope of research on the influence of blended learning in other subjects, or increasing the sample size can all be considered.

Mathematical education in general, and mathematics education at high schools in particular, creates favorable conditions for students to develop essential and core competencies and assists students in improving their mathematical competence as a foundation for good learning. It also promotes necessary skills for society, in which mathematical communication skills are essential skills. The purpose of the research is to enhance students' mathematical communication skills while studying ellipse topics. In this study, 87 students in the tenth grade were tested to see if the teaching process for accelerating the development of mathematical communication skills related to ellipse topics was effective and possible. Students in the experimental class were instructed using a four-step learning model with the activities regarding the ACODESA method and mind map, whereas students in the control class were guided using the conventional way of instruction. A study design involving a pre-test, a treatment, and a post-test was used to determine the effectiveness of this type of teaching approach. Quantitative and qualitative analyses of the gathered data assessed the students' progress in mathematical language activities. The findings indicated that most students' mathematical communication skills regarding ellipse topics had improved significantly. The learners towards the above process also showed a positive attitude. In addition, the research findings have important implications and recommendations.

Many educators and policymakers worldwide have noticed the burgeoning field of experiential learning in the twenty-first century. Learning theory and practice together is beneficial to education in general, and mathematics education in particular, because it enables students to realize their full potential for knowledge and skill, and it connects the two aspects of knowledge. A focus on the cross-cutting and critical role of experience activities within the framework was emphasized in Vietnam’s general education program in mathematics, released in 2018 and included views on the content and methods of teaching and learning mathematics in the country. Experiential learning in mathematics was studied to see if this method could positively help students participate, increase their motivation and interest in learning, and impact their math outcomes. A series of pedagogical experiments with 29 sixth-grade students on arithmetic and geometric topics was conducted to confirm the research goals. Students were required to develop solutions to real-world problems related to their studying subjects. The experimental and control classes are subjected to a pre-test and a post-test design. Mixed methods, including qualitative and quantitative analysis, are handled by the statistical data processing software (SPSS) program and the results of observations and surveys of learners’ opinions. The results were found that experiential learning activities positively influenced math learning attitudes and student achievement progress in the classroom.

Teaching mathematics in general and instructing mathematics at junior schools in particular not only create favorable conditions for students to develop essential and core competencies but also help students enhance mathematical competencies as a foundation for a good study of the subject and promote essential skills for society, in which mathematical communication skill is an important one. This study aimed to train students in mathematics communication by presenting them with topics in line with the structure's congruent triangles. An experimental sample of 40 students in grade 8 at a junior school in Vietnam, in which they were engaged in learning with activities oriented to increase mathematical communication. A research design employing a pre-test, an intervention, and a post-test was implemented to evaluate such a teaching methodology's effectiveness. For assessing how well the students had progressed in mathematical language activities, the gathered data were analyzed quantitatively and qualitatively. Empirical results showed that most students experienced a significant improvement in their mathematical communication skills associated with congruent triangles. Additionally, there were some significant implications and recommendations that were drawn from the research results.

Mobile learning (m-learning) is a crucial educational technology for teacher education due to its significant benefits and the development of mobile technology. This study’s objective is to conduct a systematic review and present a recent synthesis of the m-learning literature from 2018 to 2023 in teacher education relating to subject publication year, geographic distribution, matter domains, mobile devices and technologies used, research methodologies used to examine the implementation of m-learning, results for pre-service teachers, as well as benefits and challenges of m-learning adoption. The study used the systematic review methodology and PRISMA guidelines. A list of 27 studies was included from several relevant studies in four, Google Scholar, Mendeley, ScienceDirect, and Scopus, databases using inclusion and exclusion criteria to evaluate the full text after screening the titles and abstracts. The results of this study show that m-learning has garnered interest in numerous nations worldwide, applied in different subject matter domains with the use of various mobile devices and technologies. More significantly, the findings show that using mobile learning to learn positively impacts how pre-service teachers develop their knowledge, skills, and attitudes. Additionally, adopting this learning style recently in teacher education has certain advantages and challenges, requiring lecturers, pre-service teachers, and institutions to have the necessary equipment for knowledge, skills and facilities to achieve efficiency. Consequently, the results of this study can be used as a guide for research on m-learning in the future and contribute to the body of knowledge about this pedagogical strategy for teacher training.

Online project-based learning (PjBL) is an increasingly popular teaching approach in higher education, especially in teacher education. Implementing online PjBL differs across subjects, bringing many benefits while posing challenges for educators and pre-service teachers. This systematic review aims to investigate the implementation, effectiveness and challenges of adopting PjBL in teacher education during the COVID-19 pandemic. The review provided a thorough overview of research on PjBL in teacher education during the COVID-19 pandemic, which was carried out using the systematic review methodology and Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines. Several relevant articles from five different databases (Google Scholar, Mendeley, ScienceDirect, Scopus, and Taylor & Francis Online) were collected using the keywords “project-based learning” and “teacher education” along with their synonyms. A final list of 26 included articles to be reviewed in this study is produced after the titles and abstracts screening and full texts evaluation using inclusion and exclusion criteria. This systematic review reveals that PjBL has been applied in teaching various subjects in teacher education with different types of projects and assessment methods. More importantly, integrating PjBL in teaching has been proven to positively impact the development of pre-service teachers’ knowledge, professional skills and learning attitudes. In addition, applying PjBL poses certain challenges for educators due to the requirements on teachers’ and students’ knowledge and skills as well as equipment and technology facilities. On the other hand, the COVID-19 pandemic, if viewed positively, contributes to boosting educators’ motivation and facilitating the implementation of online PjBL. The study findings can be used as a reference for future PjBL research and contribute to the literature on PjBL in the context of teacher education.