1. Scenario: suitable for families, kindergartens, early childhood centers, nurseries, parent-child kindergartens and other early childhood institutions. 2. For children, the most important thing to learn mathematics well is to lay a good foundation and help them to establish the concept of quantity and number. Decimal bank game, the combination of beads and digital cards, can let children know the correspondence between quantity and number, more intuitively understand the relationship between quantity and number, and improve their interest in learning