List VOL.3 (6) NO.1 (3) NO.2 (3) 【Research Article】  Relationship between Number-Line Estimation Ability and Mathematics Achievement of Second Graders in Elementary School      Author:Yuan Yuan, Sue-Feng Wang, Kuo-Long Chen Research Article 【中文】  Based on Cabri 3D and Physical Manipulatives to Study the Effect of Learning on the Spatial Rotation Concept for Second Graders      Author:Yu-Jie Wang, Kaung-Hsung Chen Research Article 【中文】  Discourse on the Constituent of Literacy for Mathematical Culture in Terms of the Relationship between Mathematics and Culture - Theoretical and Case Analysis      Author:Po-Hung Liu Research Article 【中文】