我们经常要求学生要有思考的意识,要学会数学地思考问题。对教师而言,无论是数学课堂教学研究,还是研究数学,研究和思考是必要的,是准确把握教学内容、灵活解决数学问题的保证。教学片断一:“求一个数的近似数拓展练习”师:我们怎样求一个数的近似数呢?生1:用四舍五入法。生2:首先要看保留到哪一位,然后再看省略部分最高位上面的数字,若小于5就省略而且省略部分改 We often ask students to have a sense of thinking, to learn to think mathematics problems. For teachers, both mathematics classroom teaching and research, mathematics, research and thinking are necessary, is to accurately grasp the teaching content, the flexibility to solve mathematical problems guarantee. Teaching a fragment: “Seek a number of approximations to expand the practice ” Teacher: How do we find a number of approximations? Health 1: Use the rounding method. Health 2: First of all depends on which one to retain, and then look at the omission of some of the highest figure above, if less than 5 to omit and omit some of the changes