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The chapter describes the flipped classroom practice with video contents in elementary school arithmetic. Japanese students have acquired relatively high scores in international well-known competency-achievement tests like PISA and TIMISS, and then, it is believed that the educational system in Japan gets in good success to put the basic competency onto the students. However, the teachers in Japan feel that the students should acquire more ability to apply the basic competency to the real problems smoothly and actively. The authors performed flipped classroom at an elementary school using consulting preparatory teaching videos for partial flipped teaching, transferring “understanding subjects,” “recalling already learned items,” and “self-solving” to home learning, and closely connecting learning (preparation) at home and in the classroom to upgrade the students' abilities that can solve more complex and advanced problems smoothly.