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高小算术第三册第一单元是“约数和倍数”,这个内容是学习分数四则运算的基础。因为要学习分数的四则运算,必须有约分、通分的知识和计算技能,要学习约分、通分,又必须先学习有关公约数、公倍数的知识。因此,在学习分数之前,必须先学习“约数和倍数”这一部分内容。这一单元我经过初步钻研,觉得在数学中,要考虑到下面几点 1、掌握教材的系统,明确教学的重点。这一单元教材的编排系统是:首先,讲解数的整除的特征,即课本中所讲的“能被2、5、3等数整除的数”;其次,讲解“数的质因数分解”;最后,讲解“公约数、最大公约数、公倍数、最小公倍数”。
The first unit of high and small arithmetic book three is “divisor and multiple”, this content is the basis for learning scores four arithmetic. Because you want to learn the arithmetic of the four scores, you must have about three points: knowledge and calculation skills. To learn about points and divide points, you must first learn about the common divisor and common multiple points. Therefore, you must first learn the “divisor and multiple” section before you learn the score. After a preliminary study of this unit, I think in mathematics, to take into account the following points 1, to master the textbook system, a clear focus of teaching. This unit textbook choreography system is: First of all, to explain the characteristics of the number of divisions, that is, the text of the book “can be divided by 2,5,3 and so on the number of”; secondly, to explain the “prime number factorization”; Finally, explain the “common divisor, the greatest common divisor, the common multiple, the least common multiple.”