Abstract
Van de Walle (2007) is among many writers for preservice teachers to stress the importance of proportional reasoning, devoting an entire chapter to it (Chapter 19): “The development of proportional reasoning is one of the most important goals of the 5-8 curriculum. … Proportional reasoning is indeed the cornerstone of a wide variety of topics in the middle and high school curriculum” (p. 353). He goes on to list the topics of fractions, algebra, similarity, data graphs, and probability, each of which is considered as part of a separate chapter.
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