The purpose of this research is to find: 1). Student's achievement in mathematics representation ability who followed the learning process using Think, Talk, Write strategy; 2).  Student's achievement in self-efficacy who followed the learning process using Think, Talk, Write strategy; 3). Whether a student's achievement in mathematics representation ability who followed the learning process using Think, Talk, Write strategy is better than a student who followed a direct learning process; 4). Whether a student self-efficacy who followed the learning process using Think, Talk, Write strategy is better than a student who followed a direct learning process.The population of this research is a whole of the 8thgrade students from Junior High Schools from Purbalingga. The sampling process is determined by a cluster random sampling technique so that the research can obtain the experiment class in which learning proses are using the TTW strategy with 71,81 rate, meanwhile, students who are following direct learning are around 62,94. Based on the student self-efficacy questionnaire who followed learning process with the TTW strategy are 74,37 rate, meanwhile students who are following direct learning are around 66,37. The data analysis using independent sample T-Test to test one right side. The result of the research shows that student's achievement in mathematics representation ability who followed the learning process using the TTW strategy is better than a student who followed a direct learning process. Student self-efficacy who followed the learning process using the TTW strategy is better than a student who followed a direct learning process.

This research is motivated by demands for mastery of 21st-century skills as a form of educational reform in the 4.0 era. This study aims to explore the understanding and skills of the prospective mathematic teacher in the development of the student e-worksheet as a form of teacher skills in the 21st-century. A total of 27 math teacher candidates in Banyumas Regency, Central Java, Indonesia, who took part in training teaching material development, was formed into 9 Groups (G) and was given the task to develop student e- worksheet of mathematics of junior high school. Data were collected through observation, interviews, self-reflection, open questionnaires, and portfolios and analyzed using content analysis procedures by reading carefully to understand relevant themes. The coding and labeling are then carried out to find the meanings associated with the research objectives and theoretical framework. This study's results indicate that self-regulated learning of prospective mathematics education teachers in the development of student e-worksheet can encourage motivation to learn, self-confidence, experience, and determination to become professional teachers in the 21st century. From this study, an understanding and skill of the century 21can be explored from self-regulated learning during the development of student e- worksheet, namely collaboration and communication skills, problem-solving, creativity and imagination, innovation, and novelty, literacy, and leadership.

This study aims to determine the online learning interactions carried out by junior high school teachers in the classroom during the COVID-19 pandemic. The quantitative using survey was used as a research methodology. 141 Mathematic Teachers was selected as the subject of this research. A questionnaire of classroom interaction practice in an online class was used as a data collection technique. The result found that mathematic teachers’ interaction activity in online courses has a different level. The interaction process that mathematic teachers use is in preparing the students to join an online course and leading the discussion with the mean of 4.2 and 4.3. In contrast, the lowest interaction happens in interaction in giving feedback and interaction in closing activity with an average of 2.5. the research also found that 78.70% of mathematic teachers always provide direction to the students in starting the online class. 40.30% of them never ask students to correct incorrect assignments during online learning.

In the period of the last few decades, more complex technology have been integrated into our daily lives. Therefore, teachers are advocating that students BYOD (bring your own device). This aims are investigated the activities of students during the lesson, which enables teachers to evaluate their students' progress in learning. In addition to this, students' learning experiences and raise their levels of satisfaction with their education with Nearpod and the dynamic interaction that occurs between them. Descriptive statistics were used for the analysis. Descriptive data for the questions and items were compiled in Excel, and included frequency, percentage, mean, and standard deviation. The goal of this research is to explore how female students feel about using Nearpod in conjunction with a video-conferencing learning system on a Bring Your Own Device (BYOD) learning platform. This study was conducted at Universitas Muhammadiyah Purwokerto (n = 78 students) and Purwokerto Secondary School in Central Java (n = 83 students and 9 teachers), during the even semester of the 2020/2021 school year. The objectives of this study required the development and administration of a questionnaire to all of the women enrolled in the "Mathematics Education" course. Researchers concluded from their study that students are open to using their own devices in class and are willing to benefit from the affordances provided by the BYOD platform and the Nearpod to engage in active learning during lectures. Therefore, there has to be more work done by universities to figure out which of the growing elements of education should be prioritized in order to create the best possible conditions for instruction and learning.

The mosque is the oldest Islamic culture which is the centre of civilization for Muslims for every group, both adults and children. However, so far the mosque environment is rarely used as an effective learning resource to explore more contextual, meaningful and educational mathematics material. The purpose of this study was to explore mathematics teaching materials and religious values from objects (artefacts) around the mosque. The artefacts explored are mosque objects that have religious values, namely prayer rugs, prayer rugs, mosque reliefs and covers of the Qur'anic manuscripts. The research location is in the Baitu Usyaqil Quran (BUQ) Mosque and the Pesantren Darussalam Purwokerto Mosque, Banyumas, Central Java. The data collection method uses observation, documents and a literature review. The data analysis technique used descriptive qualitative analysis. The results showed that, prayer rugs, prayer rugs, mosque reliefs and covers of the Qur'anic manuscripts contain various transformational geometry concepts such as symmetry, reflection, translation, rotation, and dilation. The results of this study are very important for developing a mathematics curriculum based on student culture.