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《新课程标准》指出,数学教学应该是从学生的生活经验出发,向他们提供充分从事数学活动与交流的机会,帮助他们在自主探索的过程中,真正理解和掌握基本的数学知识与技能、数学思想与方法,同时获得广泛的数学活动经验,成为学习数学的主人。教学再现第一次教学:通过创设情境引出例6(题略),然后让学生尝试解答例题,接着揭示比例尺这一概念,最后安排了一些相应的练习。在练习中我设计了这样一道题目:出示了2张同样大小的地图,一张是中国地图,一张是世界地图,它们分别用了1比600万和1比3300万的比例尺,请同学们选择合适的比例
The New Curriculum Standard states that mathematics teaching should start from the students’ life experience and provide them with opportunities to fully engage in math activities and exchanges so as to help them truly understand and master basic math knowledge and skills in their own exploration. Mathematical ideas and methods, at the same time gain a wide range of mathematical activities experience, become the master of learning mathematics. Teaching Reproduce the first teaching: through the creation of case 6 (title), and then let the students try to answer the example, then reveal the concept of scale, and finally arranged a number of corresponding exercises. In practice, I designed such a topic: produced two maps of the same size, a map of China, a map of the world, they were used 1 to 6 million and 1 to 33 million scale, the students Choose the right ratio