Abstract
In this study, we aim to improve an educational practice of "speed" that many
children are difficult for understanding. In that case, we use the RTMaC lesson
study with cooperation of elementary school’s teachers, junior high school’s
teachers, high school’s teachers and university's teachers. In this paper, we
examined children's cognition of "speed" by a teacher's made original cognition
test, and we discussed improvement's teaching points of it. As a result, it has
become clear that children’s cognition trend of "speed", and an improvement
viewpoint for the teaching.
