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Young Mathematicians at Work: Constructing Number Sense, Addition and Subtraction, Catherine Twomey Fosnot and Maarten Dolk, 2001. xx + 193 pp., $22 paper. ISBN 0-325-00353X. Heinemann, 361 Hanover St., Portsmouth, NH 03801-3912.
As a teacher educator, I was excited by this highly accessible introduction to Freudenthal's theory of mathematizing. The authors use a number of classroom vignettes from the Mathematics in the City project to illustrate mathematizing and to...





