TY - CHAP U1 - Konferenzveröffentlichung A1 - Rick, Jochen A1 - Bejan, Alexander A1 - Roche, Christian A1 - Weinberger, Armin T1 - Proportion: Learning Proportional Reasoning Together T2 - 21st Century Learning for 21st Century Skills : 7th European Conference of Technology Enhanced Learning, EC-TEL 2012, Saarbrücken, Germany, September 18-21, 2012. Proceedings KW - Conceptual change KW - Word problem KW - Symbolic representation KW - Mathematical understanding KW - Proportional reasoning Y1 - 2012 SN - 978-3-642-33263-0 SB - 978-3-642-33263-0 U6 - https://doi.org/10.1007/978-3-642-33263-0_52 DO - https://doi.org/10.1007/978-3-642-33263-0_52 SP - 513 EP - 518 PB - Springer CY - Berlin ER -