Formal operational, Thinking about abstract concepts, such as “freedom., Preoperational (1), Enjoying imaginary play (such as dress-up)., Concrete operational (1), Understanding that physical properties stay the same even when objects change form., Concrete operational, Having the ability to reverse math operations., Sensorimotor, Understanding that something is not gone for good when it disappears from sight, as when Mom “disappears” behind the shower curtain., Preoperational, Having difficulty taking another’s point of view (as when blocking someone’s view of the TV)..

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