Scaling-continuous variation: supporting students’ algebraic reasoning

Scaling-continuous variation: supporting students’ algebraic reasoning
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尺度连续变化:支持学生的代数推理

DOI:
10.1007/s10649-020-09951-6
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发表时间:
2020
影响因子:
3.2
通讯作者:
Tasova, Halil
Tasova, Halil
中科院分区:
数学2区
文献类型:
--
作者:
Ellis, Amy;Ely, Robert;Singleton, Brandon;Tasova, Halil

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本文介绍了一种新的变分和协变推理模式,我们称之为标度连续推理。缩放-连续推理需要(a)想象一个变量在任何尺度下取连续体上的所有值,(b)理解连续体在任何尺度下都不会变得离散,(c)重新缩放到任意小的增量,并将该缩放与相关的值进行协调。通过对两名12岁的学前代数学生进行15小时的教学实验分析,我们提出了标度连续推理的证据,并确定了学生理解变化率的两种含义:将恒定速率视为等价类比率,将瞬时变化率视为潜在速率。我们认为尺度连续推理可以支持对功能和变化率的稳健理解。
This paper introduces a new mode of variational and covariational reasoning, which we call scaling-continuous reasoning. Scaling-continuous reasoning entails (a) imagining a variable taking on all values on the continuum at any scale, (b) understanding that there is no scale at which the continuum becomes discrete, and (c) re-scaling to any arbitrarily small increment forxand coordinating that scaling with associated values fory. Based on the analysis of a 15-h teaching experiment with two 12-year-old pre-algebra students, we present evidence of scaling-continuous reasoning and identify two implications for students’ understanding of rates of change: seeing constant rate as an equivalence class of ratios, and viewing instantaneous rate of change as a potential rate. We argue that scaling-continuous reasoning can support a robust understanding of function and rates of change.
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发表时间: 2012
影响因子: 3.2
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