## Contents

**Tangrams: On Attention and Error**by*TAY Eng Guan*(pp. 67-75)**Twelve Erroneous Proofs**by*TOH Pee Choon*(pp. 76-85)**Revealing Prospective Secondary Teachers’ Mathematical Knowledge for Teaching in Teacher-Created Representations of Practice**by*Alyson E. Lischka, Yvonne Lai, Lindsay Czap and Jeremy F. Strayer*(pp. 86-106)**A Semester-Long Flipped Calculus Course for Pre-Service Teachers in Singapore**by*NG Wee Leng, TEO Kok Ming, WONG Khoon Yoong and KWAN Kang Ling*(pp. 107-126)**BOOK REVIEW – Mathematics Education in Singapore**. Reviewed by*Catherine P. Vistro-Yu*(pp. 127-133)**Acknowledgements**(p. 134)