Once she has achieved the stage of concrete operations, a girl should be able to

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The stage of concrete operations, as defined by Piaget, typically occurs between the ages of 7 and 11. At this stage, children can think logically about concrete events and can understand the concept of conservation, order, and categorization, such as arranging objects by height. Understanding algebra and thinking logically about hypothetical propositions are skills that develop in the formal operational stage, which begins around age 12.

Once She Has Achieved the Stage of Concrete Operations, a Girl