Vol. 6 Num. 3 (1986) Pearla Nesher Are mathematical understanding and algorithmic performance related?2 Nicolas Balacheff Cognitive versus situational analysis of problem-solving behaviors10 Victor J. Katz Using history in teaching mathematics13 Arthur Powell Economizing learning: the teaching of numeration in Chinese20 Joel Hillel Un château en Espagne24 Christine Keitel Social needs in secondary mathematics education27 Jan Einar Nordgreen To an excellent math teacher33 David Fielker Which operation? Certainly not division!34 David Wells Two letters I39 Tommy Dreyfus , Theodore Eisenberg Two letters II40 Norma C. Presmeg Visualisation in high school mathematics42