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Proportional reasoning has been recognised as a crucial focus of mathematics in the middle years and also as a frequent source of difficulty for students(Lamon, 2007). Proportional reasoning concerns the equivalence of pairs of quantities that are related multiplicatively; that is, equivalent ratios including those expressed as fractions and percents. Students who do not learn to reason proportionally are unequipped to learn mathematics topics such as similarity, scaling, and trigonometry. Proportional reasoning is also essential to understanding rates and hence many science concepts such as speed, density and molarity.
机译:比例推理已被认为是中级数学的重点,也是学生学习困难的常见原因(Lamon,2007)。比例推理涉及成对相关的成对数量的等价性;也就是说,等效比率包括以分数和百分比表示的比率。那些不按比例学习推理的学生将不具备学习数学主题的能力,例如相似性,比例和三角函数。比例推理对于理解速率以及因此了解许多科学概念(例如速度,密度和摩尔浓度)也至关重要。

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