WHY IT IS SO HARD TO CHOOSE A GOOD OPEN PROBLEM FOR COOPERATIVE WORK IN PRIMARY MATHEMATICS EDUCATION?

2021 ◽  
Author(s):  
Tünde Berta ◽  
Zuzana Árki
2008 ◽  
Author(s):  
Ben A. Vollaard ◽  
Lila Rabinovich ◽  
Richard Bowman ◽  
Christian van Salk

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