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How old are the math books used by children now?
The current primary school mathematics book published by Beijing Normal University is 26 cm long, 18.5 cm wide and 2.6 cm thick.

Primary school mathematics textbooks include the new curriculum standard experimental edition, people's education edition, Beijing Normal University edition, Zhejiang Education edition, West Normal University edition, Qingdao edition, Jiangsu edition, Hebei edition, Qingdao edition, Shanghai edition and so on.

Among them, people's education edition does the best. Books published by People's Education Publishing House generally refer to textbooks. Generally speaking, people's education edition is relative to the textbooks published by other publishing houses in terms of the significance of textbooks. For example, the textbook published by Guangdong Education Publishing House is called Guangdong Education Edition, the textbook published by Shanghai Education Publishing House is called Shanghai Education Edition, and the textbook published by Changchun Publishing House is called Changchun Edition.