LEARNING EFFECTIVENESS THROUGH VIDEO PRESENTATIONS AND WHATSAPP GROUP (WAG) IN THE PANDEMIC TIME COVID-19

This study aims to determine the effectiveness of learning through video presentations and Whatsapp Group (WAG) on topic vector space during Covid-19 pandemic. The system is carried out online using videos developed by researchers shared via WAG. research action conducted in two cycles with each cycle consisting four meetings. subjects this were 14-second semester students Mathematics Education Study Program Faculty Teacher Training Education, Universitas Mahasaraswati Denpasar who took Linear Algebra courses. data collected researcher's actions, results evaluation, student responses presentation WAG applied researcher. indicate that application pandemic was classified as effective, because average score increased 12.9% 1.3% respectively class before 68, after I 76.79 II 77.79. Student regarding very positive. strategy can be used a solution pandemic, which requires lecturers carry teaching process from home.