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Proportional reasoning: from shopping to kitchens, laboratories, and, hopefully, schools. Proportionales Denken: vom Einkauf in die Kueche, ins Labor und, hoffentlich, in die Schule. (English)
Fourteenth PME conference with the North American Chapter twelfth PME-NA conference. Vol. 3. Proceedings. 14. PME-Konferenz mit der 12. PME-NA-Konferenz der nordamerikanischen Abteilung. Bd. 3. Beitraege. Editor(s): Booker, G.; Cobb, P.; Mendicuti, T.N. de International Group for Psychology of Mathematics Education; International Group for Psychology of Mathematics Education (United States). North American Chapter 1990. p. 67-73 of 362 p. Available from FIZ Karlsruhe. Conference: 14. Conference of the International Group for the Psychology of Mathematics Education (PME), Oaxtepec (Mexico), 15-20 Jul 1990
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