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Although hannah understands the principle of conservation and basic mathematical operations, she has difficulty understanding hypothetical questions and attempts to solve problems unsystematically, by trial and error. according to piaget, hannah has not yet attained the cognitive skills characteristic of the _____ stage.

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MsClementine
Hannah has not yet reached the Formal Operations Stage.  According to Piaget, this stage starts at age 12 and lasts into adulthood.  In this stage, people are able to think about abstract problems without the need for a concrete item.  An example is solving abstract mathematical problems. 

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