Hello, parents, I recommend you to use Dona Love Mathematics, which is a set of ladder mathematics enlightenment series developed by New Oriental for preschool children. There are three series: basic articles, introductory articles and promotion articles. The series "Dona Love Mathematics" is accurately positioned and compiled in strict accordance with the "Kindergarten Mathematics Education Objectives and Contents and Requirements of All Ages". Knowledge points are from easy to difficult, suitable for children in small classes, middle classes and large classes in kindergartens, and are sold on major e-commerce platforms such as JD.COM, Tmall and Dangdang. I hope my answer is helpful to you!