Abstract
Promoting an understanding of multiplication of fractions has proved difficult for mathematics educators. I discuss a research study aimed at developing a concept of multiplication that supports both multiplication of whole numbers and multiplication of fractions. The study demonstrates how domain-specific theories grounded in two major psychological theories contribute to the development of an empirically based approach to developing this concept. Specifically, the researchers used Learning Through Activity, grounded in constructivism, and aspects of the Elkonin-Davydov Curriculum, grounded in Russian activity theory (sociocultural theory).
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Notes
- 1.
See Simon, Kara et al. (in press) for the additional reasons that guided reinvention is a core principle of LTA.
- 2.
The MARN researchers modified JavaBars by creating an “iterate” button. The iterate button takes a bar and a counting number (we will call it “n”) as inputs and creates a new bar that is n times as long as the original bar. We are grateful to Frank Iannucci for programming this modification.
- 3.
Whether the multiplicand is a fraction or a whole number was not a problem for Kylie and tends not to be a problem for students with a multiple-groups concept of multiplication. They can easily think about iterating a fractional quantity a whole number of times.
- 4.
This convention was used in the Elkonin-Davydov curriculum. It was useful to us because the order of factors was consistent with the student activity (i.e., creating a bar to represent the multiplicand and using the multiplier to act on the multiplicand).
- 5.
The analyses of data can be found in Simon, Placa et al. (in press).
- 6.
See in press, Placa for a detailed account.
- 7.
We have switched from JavaBars to Fraction Bars (Kaput Center for Research and Innovation in STEM Education, 2015). The latter is a more user-friendly application based on JavaBars
- 8.
In this discussion, we focus only on multiplication involving two factors. The MAKE button could be used to produce a product of three or more factors.
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Simon, M.A. (2019). Developing a Concept of Multiplication of Fractions: Building on Constructivist and Sociocultural Theory. In: Norton, A., Alibali, M.W. (eds) Constructing Number. Research in Mathematics Education. Springer, Cham. https://doi.org/10.1007/978-3-030-00491-0_9
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