Abstract
The process of forming skills to operate with groups of objects is the most important field of mathematics studied at preschool age. This process itself includes a series of actions with objects such as: selection, grouping, classification, comparison, sorting and ordering the objects according to different criteria. High preschool age is the period in which children operate with groups of objects using 2 and more criteria. At this age, preschoolers apply more easily selection, grouping, sorting, ordering than comparison, classification and series. The didactic game can be used to develop these skills.

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