Developing a Think-Pair-Share Cooperative Learning-Based E-book Module in Improving Students’ Mathematical Communication Skills in Elementary School

Based on the pre-research activities covering interviews, observation and data documentation which were conducted in the fifth-grade of State Elementary School Pandeanlamper 05 Semarang (SD Negeri Pandeanlamper 05 Semarang), it was found that students encountered difficulty in comprehending and communicating mathematics questions, particularly with the measurement material. The underlying cause of this problem is the transition from online to offline learning. During the process of online learning, students tend to use gadgets, while during face-to-face learning, they do not. Moreover, students’ interest towards learning tends to decrease, because the modules used by the teachers are still limited and not various. Teachers have not integrated technology into learning activities optimally, which is supposed to be implemented to succeed in the improvement of students' mathematical communication skills in elementary school. Therefore, this research aims to develop and examine the effectiveness of developing a think-pair-share cooperative learning-based e-book module for mathematics subject in improving students’ mathematical communication for the fifth-grade students of SDN Pandeanlamper 05 Semarang. This research used the research and development (R&D) method and adapted the ADDIE model postulated by Branch. The instrument of data collection of this research was validation sheet questionnaires that were given to several expert validators, and the effectiveness tests were conducted in the control class and experimental class. The results of analysis from the media expert, material expert, and learning expert were obtained through the analysis of the quantitative data by using criteria guidelines with the assessment categories to determine the quality of the product that was being developed and to examine its effectiveness by using the independent sample t-test. The validation result taken from the media expert obtained a percentage score of 92% which can be categorized as "very feasible", the result taken from the material expert obtained a percentage score of 94,3% which can be categorized as "very feasible", and the result taken from learning expert obtained a percentage score of 95% which can be categorized as "very feasible", and also the result of t-test showed that the significance value of two-tailed test with t < 0,05 has a meaning that H0 is rejected and Ha is accepted. Based on the collected data, it can be concluded that a think-pair-share cooperative learning-based e-book module in improving the students' mathematical communication skills of the fifth-grade students of SDN Pandeanlamper 05 Semarang is feasible to be used. Keywords: E-book Module, Think Pair Share, Mathematical Communication, Elementary School