English, 26.02.2020 21:03 AdiGirlBrainly

Students do not usually work with mathematical variables until they are between 12 and 13 years of age. At this point, students are capable of the abstract thinking and hypothetical reasoning characteristic of Jean Piaget's stage of cognitive development.

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Students do not usually work with mathematical variables until they are between 12 and 13 years of a...