所谓估算,就是根据题意和有关的计算知识,不经具体演算迅速地得出接近准确的结果或对结果进行大体估计。有计划地培养学生的估算能力,能促进儿童思维能力的发展,提高课堂教学效果。估算训练应注意儿童的生理、心理特点,紧扣教材内容,由简单到复杂。一般在三年级以上进行。每次练习以 The so-called estimate, is based on the topic and the relevant knowledge of the calculation, without specific calculations quickly come to near-accurate results or general estimates of the results. The ability to train students in a planned manner can promote the development of children's thinking skills and improve the effectiveness of classroom teaching. Estimated training should pay attention to children's physiological and psychological characteristics, closely linked to the textbook content, from simple to complex. Generally in the third grade or more. Every practice