This study aimed to improve of mathematical communication, mathematical connection and analyze mathematical dispositions of students by using the CORE (Connecting-Organizing-Reflecting-Extending) learning model. The study applied a mixed method with embedded design. The subject were 82 X grade students of high school in Sukabumi, West Java, Indonesia. It divided into 42 students for the experimental group and 40 students for the control group. The research data were obtained through well-structured tests of mathematical communication and mathematical connection, mathematical disposition questionnaires, observation sheets, and interviews. Data analysis used t-test, correlation test, descriptive statistic and qualitative. The results indicated that; 1) the CORE learning model can improve students' mathematical communication and connection skills, 2) the mathematical communication for topic I=76.46; topic II=70.98; topic III=72.87;; and the mathematical connection for topic I=80.07; topic II=79.98; topic III=75.78; post-test=80.27; 3) mathematical communication and connections of students who learned with the CORE model was better than those used expository learning, 4) mathematical dispositions of students who learned with the CORE model was higher than those used expository learning as well and 5) there were correlation among mathematical communication, mathematical connection and mathematical dispositions.

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This study aims to integrate ethnomatematics into augmented reality technology in learning geometry. The research method used was ADDIE (Analysis, Design, Development, Implementation, and Evaluation) approach. The stages used in this study consisted of (1) exploration; (2) design, (3) development; and (4) implementation. This study used two data analysis techniques: (1) qualitative was conducted for exploration studies, describing the design and development process; (2) quantitative was conducted to investigate the result of the use of integrated ethnomathematics AR technology implementation to 56 Mathematics pre-service teachers’ at Indramayu, Indonesia. The results showed that (1) ethnomathematics values in the form of uma lengge traditional house, ethnic karo houses, wa rebo traditional house, demak grand mosque, kaghati kolape kite can be used as marker objects on augmented reality technology and to explain geometry concept;. (2) The design stages consist of designing integration concepts, AR interfaces, and learning system development;. (3) the results of implementation analysis can (a) help to increase learning interaction activities (b) improve the understanding of concepts and geometry visualization, (c) provide information to Mathematics pre-service teachers’related to ethnomathematics and local wisdom in Indonesia.

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The role of technology integration on modern learning is essential to optimize the acceleration process in Higher Order Thinking Skills (HOTS). This research describes how to implement e-learning to improve HOTS of students and students’ attitude toward e-learning of mathematics, pre- learning students knowledge, duration of login in website, and correlation of variables with HOTS. The subject is 162 students in semester IV, from two different universities and are relatively different in their pre-learning knowledge. The instrument used in this research consisted of pre-learning knowledge HOTS test, students’ attitude scale and technology (computer and internet) skills self test. Based on analysis of the data, it is concluded that students’ HOTS who have studied through blended learning are much better than other learning (full e-learning and conventional approaches). Students’ HOTS with conventional model is better than full e-learning. However, students’ HOTS with full e-learning is worst than other learning (blended learning and conventional). The attitude of students towards e-learning in both learning approaches (blended learning and full e-learning) is positive. There is no significant difference in students’ attitude to these two learning ways. There is a significant correlation between pre-learning knowledge and students’ HOTS, but there is no significant correlation between students’ HOTS and students’ attitude toward e-learning of mathematics. There is a significant correlation between login duration and students attitude toward e-learning of mathematics. No significant correlation is found between login duration and students’ HOTS.