[教学背景]《认识几分之一》是人教版三年级上册第八单元《分数的初步认识》的第一课时(例1、例2、例3)。这是学生在认识掌握了一些整数的基础上第一次认识分数,从整数到分数也是数的概念的一次扩展。无论在意义上,还是在读写方法及计算方法上,它们都有很大的差异。分数概念抽象,学生接受起来比较困难,不容易一次学好。所以,分数的知识是分段教学的,三年级这个学段只是对分数进行初步认识。认识几分之一是认 [Teaching Background] “A Few Knowing Points” is the first lesson (Example 1, Example 2, Example 3) of “Preliminary Recognition of Scores” in the eighth unit of the third grade of PEP. This is an extension of the notion that students first recognize scores, from integers to fractions, based on knowing masters of integers. They are all very different in meaning, literacy and numeracy. Abstract concept of scores, students accept more difficult, not easy to learn at a time. Therefore, the knowledge of fractional teaching, third grade this section is only a preliminary understanding of the score. Recognize a few is recognized