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Preschoolers being able to add and subtract a goal in the USA ...

USA: „In about 15 years we’ve moved from virtually no preschoolers being able to add and subtract to the goal of all four-year-olds being able to do so.“

Univ.-Prof. Dr. Drew H. Bailey, „What’s the Point of Teaching Math in Preschool?“, www.brookings.edu am 13. November 2014