美国中小学“估算”课程设计及其启示

“Estimation”of curriculum design In America School and Its Inspirations

估算是发展学生数感的重要途後，是数学基本技能之一。本文研究美国估算课程的五种设计类型：数值型、图示操作型、估算价值型、关联型和开放型课程，梳理课程设计特征，以期对我囯的中小学数学估算课程设计有一定的借鉴意义。

Estimation is an important way to develop students1 number sense， is one of the basic skills in mathematics Five design types of America estimate course in this paper number operation type， Graphic operation，the estimate value， Relation and open course，Combing the coursedesign characteristics，m order to have the reference significance to our country school mathematics curriculum design of estimation