我对估算教学的兴趣,源于曾观摩过特级教师吴正宪老师所执教的“估算”一课,叹服于她对估算本质的深刻理解和对估算的教学意义的深入挖掘。当在省级赛课中观摩了一位教师所执教的“三位数除以一位数的估算”课例,就想通过这堂课把我对估算教学的思考付诸笔端。 My interest in estimating teaching stems from her “estimation” lesson taught by a top teacher named Wu Zhengxian, admiring her in-depth understanding of the nature of the estimate and in-depth exploration of the teaching implications of the estimate. When I watched the “Three-Digit Divide One-Digit Estimation” lesson taught by a teacher in a provincial class, I wanted to put my thinking on estimation teaching to the noses in this lesson.