Since the resumption of classes, we have gradually completed the connection between online and offline teaching. After returning to school, through two weeks of classroom teaching, talking with students and correcting homework, I have a further understanding of students' learning situation. This week, we finished Unit 7, sorted out the knowledge of hours, minutes and seconds, and made breakthroughs and explanations on the key and difficult points. Next, I will make a simple discussion with you on some bottlenecks encountered in this unit teaching and problems existing in students' homework.

List of questions and experience sharing

Question 1: When teaching "Draw the hour hand and minute hand according to the time on the clock", I found that it is easier for students to draw the minute hand, and most of them can draw it accurately, but it is easy to make mistakes when drawing the hour hand. For example, if you draw an hour hand representing 6: 40 on the clock face. Few students always point the hour hand to 6 when operating. Most students understand that the hour hand should be between 6 and 7, but they are not sure. Some paintings are clockwise 6, while others are clockwise 7. In the explanation of this knowledge point, how do you guide the students to operate?

Teacher Liu: Due to the study of the first two classes and the accumulation of daily experience, students have a certain perception and understanding of the time on the clock face. So when drawing an hour hand, I will guide students to observe the clock face carefully. Take 6: 40 as an example, and the numbers on the clock face take 6 as the dividing point. If the minute hand does not turn to the number 6, it means that the time is not 6: 30, so the hour hand should be drawn between 6 and 7, close to 6. For the time of 6: 40, it is obvious that the minute hand points to 8, which means it has exceeded 6, so tell the child to draw the hour hand closer to 7. If it is 6: 30, the minute hand should be drawn exactly between 6 o'clock and 7 o'clock. (Applause)

Question 2: When describing time with "hours" and "hours", students often get confused. What's the difference between hours and hours?

Mr. Hou: In previous textbooks, it was emphasized that "time" was used to represent time, and "hour" was used to represent elapsed time. In the textbooks after the curriculum reform, it is written that "time" can describe both specific moments and elapsed time, while "hour" is only suitable for describing elapsed time.

Question 3: Regarding the digital representation and Chinese character representation of when, for some special moments, students are prone to make mistakes, such as 8: 08. Corresponding to Chinese characters: 8: 08, some students asked: Can this moment be written as 8: 08?

Miss Gao: According to the exercises that appear in class refining, I think it can be expressed as 8: 08 or 8: 08.

Question 4: When calculating the elapsed time in teaching, students can use the line chart to count directly on the clock face and calculate directly. Which method is simpler and faster and easier for students to understand?

Teacher Yin: Actually, for students, it is more intuitive to calculate the elapsed time with a few minutes of line segments and numerical tables, but it is more skilled to calculate the elapsed time with the formula "elapsed time = end time-start time". What needs to be emphasized here is that when the score is not lowered enough, you should borrow 1 of "Stone" and drop it at 60 points. Facts have proved that most students still like this method. Of course, we must respect children's choices, that is, allow children to solve problems in the way they like.

Summary: Through the teachers' detailed explanation of various doubts, we have a more systematic understanding of the knowledge of Unit 7, a deeper grasp of the teaching materials and a clearer direction for future teaching. Thank you for sharing your experience.