The statement is false, concrete operations allow children to acquire a better ability to perform operations related to multiple characteristics as the mass, number, length and weight of objects.
It is a period of development proposed by the Swiss psychologist Jean Piaget, at this stage children acquire a greater ability to organize their ideas, developing better rational, logical and operational thinking.
Therefore, we can conclude that concrete operations allow the children to better characterize and order the objects, as well as being able to establish categories and organize them hierarchically.
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