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从整数到分数是数的概念的一次扩展。无论在意义、读写方法或计算上,分数和整数都有很大的差异。为了便于学生掌握这部分知识,教材分为两个小节编排。第一小节是几分之几的认识(本单元重点);第二小节是简单的同分母分数加减法(本单元难点)。教学的关键是要紧扣“初步认识”这一要求,从直观形象入手,借助丰富的感性材料,通过教具演示、讲解及引导学生看图、涂色、折纸、练习等活动,让学生知道简单分数的含义,初步认识把一个整
An expansion of the notion of numbers from integers to fractions. No matter in meaning, literacy method or calculation, the scores and integers are quite different. In order to facilitate students to master this part of knowledge, textbooks are divided into two sections arrangement. The first bar is a few percentiles (the focus of this module); the second bar is a simple addition and subtraction of the same denominator (the unit of difficulty). The key to teaching is to closely follow the requirement of “preliminary understanding”. Starting from an intuitive image, with the help of a wealth of perceptual materials, students can be taught simple, easy to understand and guide through illustrations, coloring, origami and practice through teaching aids demonstrations. The meaning of the score, a preliminary understanding of the whole