2015
DOI: 10.17051/io.2016.94175
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Two Distinct Perspectives on Ratios: Additive and Multiplicative Relationships between Quantities

Abstract: ABSTRACT. The purpose of this study was to investigate how pre-service teachers' formation of additive and multiplicative relationships support and constrain their understandings of ratios and proportional relationships in terms of quantities. Six pre-service teachers were selected purposefully based on their performances in a previous course. An explanatory case study with multiple cases was used to make comparisons within and across cases. A semi-structured interview was conducted with pairs of pre-service t… Show more

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