One of the things that differentiates the formal and concrete operational stages is that during the formal stage:

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During the formal operational stage, children show increased flexibility and creativity in their thinking, allowing them to solve problems through abstract thinking and hypothetical reasoning. Conservation is typically mastered during the concrete operational stage, and animism is common in the preoperational stage. The assumption of egocentrism, where a child assumes everyone has the same view as them, is also more present in the preoperational stage.

One of the Things That Differentiates the Formal and Concrete