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学习了《义务教育数学课程标准(2011年版)》(以下简称“修订版”)数的认识部分之后,几个关键词:负数、数感、符号感、生活与情境、知识的迁移,在脑海中盘旋,挥之不去。从这些关键词,我们品到了新数学。一、引进负数负数,是过去小学数学里没有的内容。在小学数学里教学负数的知识(只涉及负整数的初步认识)出于三点考虑:第一,负数在日常生活中的应用比较多,学生经常有机会在生活中看到负数。让他们学习一些负数的知识,有助于他们理解生活中遇到的负数的具体含义,从而拓宽数学
After learning about the cognitive part of the Mathematics Education Curriculum Standards for Compulsory Education (2011 Edition) (“Revised Edition”), several key words are negative, sense of number, sense of symbol, life and situation, transfer of knowledge, Circled in my mind, lingering. From these keywords, we made a new math. First, the introduction of negative numbers, is not the primary school mathematics content. Neglect in primary school mathematics teaching knowledge (only involves the initial understanding of negative integers) for three reasons: First, the negative in more applications in daily life, students often have the opportunity to see negative in life. Let them learn some negative knowledge, help them to understand the specific meaning of negative numbers encountered in life, thus broadening mathematics