Teaching objectives:
1, when will students read and write?
Students know the meaning of the scale on the clock face. Through intuitive operation and demonstration, they know that 1 is 60 points after observation, operation and induction.
3. Students' knowledge of experiencing time exists in our life, forming the consciousness and habit of cherishing time.
Teaching emphasis: specific methods to master reading time.
Teaching difficulties: how to time the minute hand and understand the relationship between time and minutes.
Teaching process:
First, create situations and introduce new lessons.
(Courseware situation: Liangliang's parents are cleaners, and they will go to work at four or five every morning, leaving Liangliang alone at home. No parents told him to get up for school, and he got up late for school every day. )
Teacher: Students, can you think of a way to make Liangliang get up on time and not be late for school?
Students began to actively think of ways, but agreed that the best way is to buy an alarm clock and set the time to get up. When the alarm clock rings, get up at dawn and never be late for school.
Teacher: You think this method is very good. I believe Liang Liang will never be late for school again after having an alarm clock. Are you late for school?
Health: No.
Teacher: The teacher was very happy to hear that. You are all good children who are punctual! The teacher brought the clock to our classroom today. Can you tell the time on the clock face?
Answer by roll call.
Health: 6 o'clock.
Teacher: How do you know it's 6 o'clock?
Health: The minute hand points to 12, and the hour hand points to 6, which is 6 o'clock.
Teacher: Is this classmate right? (Qi A: Yes! ) Well, this classmate is right. Your answer is really good!
Turn the clock to 7 o'clock.
Teacher: Do you know what time it is? (7 o'clock)
Teacher: The teacher got up at 6 o'clock this morning and was on his way to school at 7 o'clock. By this time, the teacher was already in class with his classmates. Who can tell us this time on the clock?
Students try to read and let them introduce their ideas. (Around 8 o'clock, a little after 8 o'clock, 8: 05)
Second, activity inquiry, autonomous learning
1, Review of Clock Surface Mechanism
Teacher: Please carefully observe the clock face on the screen (courseware) or in your hand and tell the other party what you see on the clock face. Then complete the following exercise.
There are short () and long () on the clock face; There are () numbers, namely (); There are () big cells, a big cell has () small cells, and a * * * has () small cells.
Call the students to report the situation.
Health report: there are short (hour hand) and long (minute hand) on the clock face; There are (12) numbers, namely (1, 2, 3, 4, 5, 6, 7, 8, 9, 10,1,12). There are (12) large units, one large unit has (5) small units, and one * * * has (60) small units.
2, know 1, what time.
Teacher: The students have carefully observed it! Please look at this clock face. (Courseware 4) Who can read the time on the clock face?
Health: 8 o'clock.
Teacher: Then please pay attention to this clock face again? How many squares did the minute hand go?
Health: 5 squares.
Teacher: Is it five cells? Everybody count carefully. Well, it seems that everyone's eyes are really sharp.
The teacher pointed out that it takes 1 minute for the minute hand to walk a small square.
Question: How long did it take the minute hand to walk two squares? What about 3 cells, 4 cells and 5 cells? (2 points, 3 points, 4 points, 5 points)
Teacher: Good point! How many minutes did the minute hand go from 12 to 1 just now? Why?
Health: It's five o'clock, because the minute hand has gone five squares.
Teacher: Good point! Why does the minute hand go from scale 12 to scale 1? Is everyone clear in five minutes? (clear)
(The teacher keeps moving the clock face, and the minute hand points to scale 2) Teacher: How many minutes have passed now? Why?
Health: Yes 10, because the minute hand moves two squares and is 10, 25 10, so it is 10.
Teacher: What this classmate says makes sense. Great!
Teacher: Now, please work in groups or at the same table, count, calculate and fill in, and see how many minutes have passed from the minute hand to each scale on the clock face.
The group exchanges the report, and the teacher fills in the corresponding minutes according to the report board.
Teacher: Are you all right? Tell the teacher loudly. (right)
Finally, the teacher asked: How many minutes does it take for the minute hand to walk around? Can you quickly remember how many points each scale number represents?
Student: Yes, it is 60 points. By multiplication, you can quickly remember how many points each scale represents.
The teacher moved the clock face and the minute hand pointed to the numbers.
Third, consolidate the practice.
1, the teacher said the time, and the students set the time on the clock face.
Teachers usually go to school at 6: 40 in the morning to read with their classmates. At noon, the teacher comes home from work 1 15, in the afternoon 1:50, 5:20, and at 7: 05 in the evening, the teacher begins to eat dinner.
One student in each group is required to set the clock. The whole class applauded the students who dialed the right number.
2. Go home and finish textbook exercise 23, questions 1 and 2.
3. Mathematics in life
Teacher: Students, time is in our life. Let's have a look. On February 2011818, the national flag guard raised the flag in Tiananmen Square at 7:30 am and lowered it at 4: 5 pm. This is a train ticket from Jilin to Changchun. The departure time of the train is 6 o'clock in the morning.
Design intention: Let students allocate time manually, which deepens the understanding of time and minutes and further understands the method of knowing time. In the life situation map presented, students once again deeply realized that time knowledge is closely related to our lives.
Fourth, the class summary
Teacher: The bell is ringing. You spent 40 minutes with your teacher to learn how to identify when to read, and learned 1 =60. Time is precious, and if workers and uncles seize the time to produce, they will create more products; Farmers' uncles will reap fruitful results if they seize the time to plant land; Scientists seize the time to do scientific research, which will produce many inventions; If students study hard, they will gain more knowledge. Time is a magical magician, which makes diligent people smarter and lazy people more and more stupid.