I remember that primary school teachers didn't allow children to use hand index. Hand-brain rapid calculation and hand-assistance can improve learning efficiency. Moreover, children aged 3-8 years old are the most active in the golden age of the right brain, and the development of brain potential can be promoted through the assistance of both hands. The main focus of education in Yi Dao is potential education, and its main purpose is to develop their potential, which is very helpful for children's future!