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6 years ago and 10 years ago, with a few comments: https://hn.algolia.com/?q=Math+from+Three+to+Seven

This book and the culture it come from are so influential, that many people who did "enrichment" have already been exposed to many of the activities in the book. Most famous may be the Scratch JR / code.org introductory computer programming, but with pencil and paper.




Ah good find. Macroexpanded:

Math from Three to Seven: The Story of a Mathematical Circle for Preschoolers [pdf] - https://news.ycombinator.com/item?id=17018583 - May 2018 (20 comments)

Math from Three to Seven: Chapters One and Three [pdf] - https://news.ycombinator.com/item?id=8811334 - Dec 2014 (21 comments)




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