1. Multiplication board and division board teaching aids: a multiplication board, 100 red beads, 1-10 digital pieces and a red control disc, a division board, 81 green beads, 9 green wooden people, and 2 wooden boxes. 2. The teaching aids of addition board and subtraction board are composed of one addition board and one subtraction board with 18 horizontal grids and 12 vertical grids, 18 red, 18 blue and 17 white. 3. Scenario: suitable for families, kindergartens, early childhood centers, nurseries, parent-child kindergartens and other early childhood institutions.