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Reasoning about variables in 11 to 18 year olds: informal, schooled and formal expression in learning about functions

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Abstract

This study examines expressions of reasoning by some higher achieving 11 to 18 year-old English students responding to a survey consisting of function tasks developed in collaboration with their teachers. We report on 70 students, 10 from each of English years 7–13. Iterative and comparative analysis identified capabilities and difficulties of students and suggested conjectures concerning links between the affordances of the tasks, the curriculum, and students’ responses. The paper focuses on five of the survey tasks and highlights connections between informal and formal expressions of reasoning about variables in learning. We introduce the notion of ‘schooled’ expressions of reasoning, neither formal nor informal, to emphasise the role of the formatting tools introduced in school that shape future understanding and reasoning.

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Notes

  1. We are aware that the terms ‘intensive’ and ‘extensive’ are often used for this distinction, but find that these do not make always make intuitive sense for teachers. Compound variables, according to our use, are usually rates but we want to reserve the word ‘rate’ for our discussions about understanding.

  2. We also surveyed the same number of lower attaining students but their responses were all informal so do not contribute to this paper.

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Ayalon, M., Watson, A. & Lerman, S. Reasoning about variables in 11 to 18 year olds: informal, schooled and formal expression in learning about functions. Math Ed Res J 28, 379–404 (2016). https://doi.org/10.1007/s13394-016-0171-5

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