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本册教材内容主要有时间的计算、四则式题和应用题、几何初步知识三部分。它是继整数四则运算之后进入一个新的阶段.儿童学习了整数四则运算之后,已具备了一定的计算能力,因此,学习计算时间法则是有基础的。在使儿童学习计算时间问题的同时,应教育儿童善于利用时间,养成珍惜时间的优良品质.四则式题和应用题部分,包括运算顺序和括号的练习题,继按比例分配之后,学习按两个差求未知数,求另一速
The content of this textbook mainly has time calculation, four style questions and application questions, three parts of geometric preliminary knowledge. It is a new stage after the integer four arithmetic.Children have learned a certain number of arithmetic operations, has a certain degree of computing power, therefore, learning the law of computing time is based. Children should be taught how to make use of time to develop the good quality of cherishing time, so that children can learn the calculation of time, and the four types of questions and application questions, including the operation sequence and parenthesis exercises, will continue to be allocated proportionately Two difference unknown, seeking another speed