结构化视角下的估算教学——以吴正宪老师执教的《估算》为例
Estimation Teaching from a Structured Perspective—Taking “Estimation” Taught by Wu Zhengxian as an Example

估算是小学数学教学的重要内容之一，也是学生计算能力的重要组成部分，它有助于发展学生的数学思维，培养学生数感和量感。本研究从知识结构化、过程结构化和思维结构化三方面来赏析吴老师执教的“估算”一课，有助于教师从结构化地“教”向学生结构化地“学”转变。
Estimation is one of the important contents of primary school mathematics teaching, and it is also an important part of students’ computing ability. It helps to develop students’ mathematical thinking and cultivate students’ sense of number and quantity. This study will appreciate the “estimation” lesson taught by Ms. Wu from three aspects: knowledge structure, process structure and thinking structure, which will help teachers to change from structured “teaching” to structured “learning”.