基于UbD理论的单元教学设计——“有理数的加减法”为例
Unit Instructional Design Based on UbD Theory—Taking “Addition and Subtraction of Rational Numbers” as an Example

新课程改革要求以学生为本，注重培养学生的学科核心素养。UbD理论坚持“以终为始”的理念，首先明确预期学习结果，然后确定合适评估依据，最后设计学习体验和教学三个阶段。以人教版七年级上册内容“有理数的加减法”的教学为例进行具体阐述。对学生来说掌握有理数加法法则是一种挑战，没有合适的解决方法，本文基于UbD理论提供了单元教学设计的整体过程，提供了克服有理数加法法则的教学方法和一个模型。
The new curriculum reform requires students to be student-oriented and pay attention to cultivating students’ core quality. UbD theory adheres to the concept of “beginning with the end”, which first defines the expected learning outcome, then determines the appropriate assessment basis, and finally designs the learning experience and teaching in three stages. Take the teaching of “addition and subtraction of rational numbers” as an example. It is a challenge for students to master the law of addition of rational numbers, and there is no suitable solution. Based on UbD theory, this paper provides the whole process of unit teaching design, and provides a teaching method and a model to overcome the law of addition of rational numbers.