Three types of power of number sense. (Japanese)
Sci. Rep. Fac. Educ., Gunma Univ. 59, 35-44 (2011).
1
A sequence of thought on learning process in high school mathematics. (Chinese)
Sci. Rep. Fac. Educ., Gunma Univ. 57, 15-22 (2009).
2
Communication and negotiation through open-approach method. (English)
Pehkonen, Erkki, Use of open-ended problems in mathematics classroom. , (ISBN 951-45-7591-1). 63-72 (1997).
3
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