The combination of online learning through asynchronous method and synchronous learning was an alternative solution to solve the problem and enable preservice teachers having virtual face-to-face interactions with their lecturers. However, the learning result showed that 75% of preservice teacher were unable to accomplish their elementary linear algebra material. Online learning through WhatsApp Group (WAG) was used by a mathematics teacher in higher education program in the early 2020. Based on the defragmentation carried out, students who experience false-pseudo can reflect on their mistakes and restructure the thought process that was originally false into correct and clear thought process.Learning activities were changed from face-to-face to full-online due to the COVID-19 pandemic at the end of 2019. The results showed that defragmentation was carried out on students who experienced false-pseudo through several stages, namely scanning, check some errors, repairing (disequilibration, conflict cognitive, and scaffolding), give a chance to re-work, and certain the result. The research subject were taken from students of class VIII of SMPN 5 Tasikmalaya who experienced a pseudo thingking process that focused on false-pseudo and could take responsibility for the results of their work. The data collection techniques used mathematical connection ability test with questions on the Pythagorean Theorem which contained indicators of mathematical connecetions (connections between mathematical topics, connections with other disciplines, and connections with everyday life) and unstructured interviews. This research uses a descriptive qualitative method. The purpose of this research is to describe the defragmentation of pseudo-thinking processes carried out by students in problem solving of mathematical connection abilities. Defragmentation, Thinking Process, False-Pseudo, Mathematical Connection Ability Abstract
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