一、挖掘逆向思维的丰富素材小学数学课本中存在着大量的顺逆素材,如顺逆定律、顺逆公式、顾逆运算、顺逆聚化、顺逆对应、顺逆关系、顺逆变换等等,许多数学知识也正是通过这种可逆转换来发展和深化的,这些正是训练和培养学生逆向思维的极好内容,在备课中, First, excavate the rich material of reverse thinking There are a lot of good and bad material in primary school mathematics textbooks, such as the law of Shun, Shun and inverse formula, Gu inverse operation, Shun inverse aggregation, Shun reverse correspondence, inverse relation, forward and inverse transformation And so on, many mathematical knowledge is also through this reversible conversion to the development and deepening, these are precisely the training and training of students an excellent idea of ​​reverse thinking, in lesson preparation,