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在进行講解分数的意义和性质时,必须通过图解进行直观教学,弄清分母和分子的作用和意义,使学生懂得分数的计算单位。例如要能严格的区别5尺的3/5是把5尺分做5份,其中3份就是3尺,而3/5尺,是把一尺分做5份,其中的3份只是6寸。学生首先对分数有了这样比较明确的基本概念,才能为分数教学打下基础。同时在进行分数教学时,必须认清算理,才能解决儿童思想上对分数计算上的一些模糊观念,例如乘法的积为什么会变小,而除法的商会变大的疑问。并使儿童掌握巽分母四种不同类型的计算方法: 一、四种不同类型的巽分母加减法: 1.分母都是合数,但分母不是倍
In explaining the meaning and nature of the scores, we must make intuitive teaching through illustrations and clarify the roles and meanings of denominators and numerators so that students can understand the unit of calculation of scores. For example, to be able to rigorously distinguish 5 feet 5/5 is 5 feet divided into 5 copies, of which 3 is 3 feet, and 3/5 feet, is divided into 5 copies of a foot, of which 3 are only 6 inches . Students first of all have such a relatively clear concept of scores in order to lay the foundation for teaching scores. At the same time in the teaching of scores, we must understand the arithmetic, in order to solve some of the children's ideological calculation of the vague idea, for example, multiplication product becomes smaller, and the division of Chamber of Commerce becomes larger doubt. And make children master four different types of calculation methods: One, four different types of 巽 denominator addition and subtraction: 1. The denominators are combined, but the denominator is not