"Understanding of the times" is the content of the first volume of the second grade mathematics textbook of Qingdao Edition. This lesson is the first time that children really come into contact with the abstract concept of "time". The key point is to know and understand "times", establish the concept of "times", understand that one quantity is several times that of another, and cultivate students' abstract thinking ability and mathematical expression ability. After reading Wu Zhengxian's class, I was deeply touched. I will talk about my gains in the following aspects.

First, the game import, lay the foundation

In the pre-class communication session, Mr. Wu and the children played a game of "holding a group". Teacher Wu gave a demonstration to everyone first, and the two students huddled together. How many groups can you hold? What about three people crowded together? What about four people crowded together? And inspire students to think after playing the game: such groups, copies and groups must have the same "standard"-the number of each copy is the same as the "standard" before they can be called several copies, groups and groups.

Teacher Wu introduced it with interesting games, which seemed to have nothing to do with the topic. In fact, it lays a deep foundation for the new teaching link behind, so that children can experience that "two people are a group" in the game of "holding a group". The existence of such "three groups" is actually the relationship of "times". This design can be described as extremely ingenious. In the junior class, we should always consider and design some games that fit the teaching content, so as to "moisten things quietly", stimulate students' thinking, and make abstract knowledge concrete, visual and interesting.

Second, contact the experience and fully perceive it.

Teacher Wu carefully designed the teaching link, creating opportunities for students to fully contact with real life experience. "Where have you seen the times? Tell-tell your understanding of the times ",and inspire students to actively put forward the key question to be studied in this class" What is the times? Why learn it twice? What can I do? " Let children explore new knowledge with self-awareness, fully respect their original experience, and boldly let them express it in class, no matter right or wrong. This is also very difficult for us to do in class. We are often afraid that children will make mistakes or say something unimportant. In a truly free, preset and confident classroom, it is very important for teachers to guide children to speak and express.