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纵观小学数学教材,简便计算这一教学内容贯穿整个小学数学。从低年级到中高年级都有凑整思想、变化的思想、最优思想的简便计算教学渗透。可见,简便计算这一教学内容是一个循序渐进的过程。那么如何给小学低段的孩子渗透简便计算的意识,如何让孩子理解简便计算的算理呢?笔者从执教“简便计算”一课中得到了一点思考。一、第一次执教片段(一)看图提问(二)探究新知1.【学习“多加要减”】【估】师:我们先来研究第一个问题。聪聪和强强一共领走多少本?谁来列算式?(1)学生列式,第一次反馈师:这位同学的算式你看得懂吗?请他自己来解释一下。
Throughout primary school mathematics textbooks, simple calculation of this teaching content throughout the primary school mathematics. From the lower grades to the middle and upper grades, there is a simple calculation of instructional enrichment, thought of change and optimization of ideology. Can be seen that simple calculation of this teaching content is a gradual process. So how to infiltrate the simple calculation of low-level children’s awareness of children, how to make children understand the simple calculation of the calculation? The author from teaching “simple calculation” a lesson got a little thought. First, the first coaching section (A) Look at the picture questions (B) to explore the new knowledge 1. 【Learn more to reduce】 【】 【Assessment】 division: Let’s first study the first question. Cong Cong and powerful total collar how many? This column who formula? (1) student column, the first feedback division: the classmate’s formula you understand? Please explain himself.