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教学同分母分数加减法,主要使学生理解分数加减法的意义,掌握分数加减法的计算法则。在教学时,我利用同一个例题,通过改变问题和条件,把同分母分数加减法有机地结合起来进行教学,既突出了同分母分数加法和减法之间的区别与联系,又激发了学生的学习兴趣,提高学生的思维能力和解题能力,还能缩短课时,收到较好的效果。具体做法如下:一、复习旧知识,为新授课作铺垫。1.问题。①什么叫分数单位?②5/9的分数单位是什么?它有几个这样的分数
Teaching plus the denominator fractional addition and subtraction, mainly to enable students to understand the meaning of the addition and subtraction points, grasp the rules of fractional addition and subtraction. In teaching, I use the same example to change the problems and conditions by combining the addition and subtraction with the denominator method for teaching organically, which not only highlights the difference and connection between the addition and subtraction of the same denominator, but also stimulates the students Interest in learning to improve students' ability to think and solve problems, but also shorten the class time, receive better results. Specific practices are as follows: First, review the old knowledge, to lay the groundwork for the new lectures. Problem ① What is the fractional unit? ② What is the fractional unit of 5/9? How many of these fractions