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笔算历来是小学计算教学的重点。但随着科学技术的进步,大数目的计算势必由现代计算工具来完成。因此,笔算教学应着重引导学生理解算理,概括并掌握计算法则,在推导法则的过程中发展学生的初步的逻辑思维能力,并通过必要的练习来提高计算能力。一、整数和小数的加、减法笔算整数和小数的加、减法计算法则,可以概括为三句话,即:数位对齐,从低位算起,满十进一或退一作十。其中“数位对齐”是指相同数位上的数对齐,因为只有相同数位上的数才能相加、减,这一基本规
Pen calculation has always been the focus of primary school teaching. But with the progress of science and technology, a large number of calculations will certainly be done by modern computing tools. Therefore, the pen teaching should focus on guiding students to understand the calculation, summarize and master the rules of calculation, the development of students in the process of deducing the initial logical thinking skills, and through the necessary exercises to improve the computing power. First, the integer and decimal addition and subtraction arithmetic integer and decimal addition and subtraction calculation rules, can be summarized as three sentences, namely: digital alignment, counting from the low, full of ten or a retreat for one. The “digital alignment” refers to the number of the same digit on the alignment, because only the same number of digits to add, subtract, the basic rules