2-4年级数学困难与普通儿童数量估计能力的比较

A Comparison Between Children with Mathematics Learning Difficulties and Children with Normal Mathematics Learning Abilities in Numerical Estimation Competence

选取二、三、四年级数学学习困难和数学学习正常的儿童共84名。采用数字线估计任务考察两类儿童数量估计能力的发展特点及差异。结果表明:(1)二年级儿童完成数字线估计任务的精确性显著低于其他两个年龄组;(2)数学困难儿童完成数字线估计任务的精确性显著低于普通儿童;(3)二年级数学困难儿童完成数字线估计任务时采用指数和线性函数进行表征,而其他年龄组儿童均采用线性表征形式。

A total of 84 primary school children（from Grade Two,Grade Three and Grade Four） both with mathematics learning difficulties and with normal mathematics learning abilities have been selected in this research,which,by means of the digital line estimation task,aims to probe into the development of and the difference in the numerical estimation competence of the two kinds of children.The results show the following：（1） The children from Grade Two show a significantly lower accuracy in the fulfillment of the digital line estimation task than those from Grade Three and Grade Four.（2） The children with mathematics learning difficulties demonstrate a significantly lower accuracy in the fulfillment of the digital line estimation task than those with normal mathematics learning abilities.（3） The children from Grade Two with mathematics learning difficulties perform the digital line estimation task by using an exponential and linear representation,whereas those children from Grade Three and Grade Four accomplish the task merely by means of a linear representation.