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根据上海九年制义务教育数学学科课程标准(草案)的规定要求编写的四年级第二学期数学教材,教学内容涉及的知识面广,内容比较分散。数、式、形三条线既有一定的内在联系、相互贯通;又相对独立,各有不同的侧重,它们分处于几个特定的阶段,承上启下,具有十分重要的地位。下面我们按数的认识、方程、图形面积三个主要方面作一些简要介绍。 1.数的认识由正整数扩展到分数和负整数,从九年一贯的统筹考虑,承上启下,为进一步学习作好准
According to the requirements of Shanghai Nine-year Compulsory Education Mathematics Subject Curriculum Standard (draft), the fourth grade second-year mathematics teaching materials are required to be prepared. The teaching contents involve a wide range of knowledge and are scattered in content. The three lines of numbers, types and forms have both internal relations and inter-linking; they are relatively independent and have different focuses. They are in a few specific stages and are of crucial importance. Below we according to the number of knowledge, equations, graphics, the three major areas for some brief introduction. 1. Number recognition extends from positive integers to fractions and negative integers. From nine years of consistent consideration,