美国IM 数学教科书编排结构特点及启示

Characteristics and Implications of Layout Structure of IMPACT Mathematics Textbook in America

美国初中三年，分别是6-8 年级。美国McGraw-Hill 公司 2009 年出版的《IMPACT Mathematics》编写很有特色，以探究为主线。该教科书内容构成分为数与代数、测量与几何、统计与概率三部分，分布权重分别是15：3：2，特别重视数与代数内容，分别对其编排形式及呈现方式进行了研究，IM 教科书带给我们一些启示：注重数与代数内容；重视探究；重视应用；注重多学科联系；重视计算机（器）。

The education system of junior middle school is three years from grade 6 to grade 8 in America. McGraw-Hill Companies published a set of mathematics materials named IMPACT Mathematics in 2009. The textbooks, which focus on the exploration of mathematic problems, were quite distinctive. The materials include three components: number and algebra, measurement and geometry, probability and statistics, making up about 15:3:2 respectively. We can figure out that number and algebra is very important in American textbooks. In addition, the form of layout and the presentation of knowledge is studied. In the end, we get inspiration form the materials, such as paying more attention to number and algebra and technology, emphasizing exploration and use, laying stress on the close ties to the other subjects.