本册教材的内容顺序,可以把长度单位移在四则应用题后面,学习了千以内数的认识,紧接着就学习千以内数的四则运算。因为千以内数的认识是学习千以内数的四则运算的基础。原教材在千以内数的认识之后插了长度单位里丈的认识,把知识割裂,同时学习里丈后又不能马上运用,不如调在第八单元更妥当.原教材里式题和应用题混编在一起,而同样类型的应用题又往往分散在各个练习中,这样不能突出知识的本质、规律,给学生带来了学习上的困难。儿童对概念还没有掌握,运算还没有达到熟练,马上就要求他们解答应用题,要求正确理解题意,列出算式,正确熟练进行计算,这样任务较重,不易达到 The order of the contents of this textbook, the unit of length can be moved behind the four application questions, learning more than a thousand understanding, followed by the number of learning within four arithmetic. Because understanding within a few thousand is the basis for learning four arithmetic operations within one thousand. The original text in the number of thousands of knowledge inserted after the length of the unit Zhangzhang knowledge, the knowledge of the division, while learning the husband can not be used immediately, it is better to tune in the eighth unit is more appropriate. Compiled together, and the same type of application questions are often scattered in various exercises, so that can not highlight the essence of knowledge, laws, to bring students the learning difficulties. Children have not yet mastered the concept, computing has not yet reached proficiency, immediately asked them to answer questions, ask the correct understanding of the questions, formulating formulas, the correct proficiency in computing, so heavy task, not easy to reach