internet, blackboard, live, math, academic, answers, black board, broadcast, class, classroom, confident, coronavirus, covid-19, distance teaching, e-learning, education, elementary school, equation, explain, female, formula, laptop, lecturer, lesson, live stream, mathematics, method, multiplication, notebook, online, people, pointing, primary school, professional, record, remote, school, speaking, talking, teacher, teaching, video, webcam, woman, young