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五年制小学数学通用教材第五册第二单元是“多位数的加法和减法”,它与义务教育教材中的“亿以内的加法和减法”基本相同,教学内容包括多位数的加法、加法运算定律、多位数的减法、加减法的关系和加减法的一些速算法;教学重点是加法的运算定律和加减法的关系;教学难点是应用加减法的关系求未知数。教学目的是使学生“会笔算多位数的加减法,会口算整万数的加减法和几百几十加减几百几十,学会简算接近整十、整百数的加减法,初步掌握加减法算式中各部分之间的关系,并能根据这种关系求未知数X”。根据义务教育教学大纲和教材的精神,结合本人的教学实践,提几点教学建议,供教师们参考。 一、运用迁移,使学生轻松愉快地获得新知。 苏联教育家苏霍姆林斯基指出:“教给学生能藉助已有的知识去获得新知识,这是最高的教学技巧之所在。”数学有严密的逻辑性,较强的系统性,大部分新知
The fifth unit of the five-year primary school mathematics universal textbook is the second unit of “multi-digit addition and subtraction”, which is basically the same as the “addition and subtraction within 100 million” in the compulsory education textbooks, teaching content includes multi-digit addition , The law of addition, the subtraction of multi-digit, the relationship between addition and subtraction and addition and subtraction of some of the speed algorithm; teaching emphasis is the law of addition and subtraction addition; the difficulty of teaching is the application of addition and subtraction of the relationship between the unknown . The purpose of teaching is to enable students to “read and write multi-digit addition and subtraction, will count the whole number of additions and subtractions and hundreds of dozens of dozens of dozens of additions and subtractions, Act, preliminary grasp the relationship between the various parts of the addition and subtraction formula, and can find the unknown under this relationship X ”. According to the spirit of compulsory education syllabus and teaching materials, combined with my teaching practice, mention some teaching suggestions for teachers reference. First, the use of migration, so that students easily and happily get the new knowledge. Sukhomlinski, a Soviet educator, pointed out: “Teaching students to use existing knowledge to acquire new knowledge is the highest instructional skill.” Mathematics has strict logic, strong systematicness, Some new knowledge