# 3 # Introduction The following is the relevant information of the "Second Understanding" teaching plan for the third grade of primary school mathematics, hoping to help you.

Model essay on the teaching plan of "understanding of seconds" in mathematics in the third grade of primary school.

Teaching goal: 1, knowing the time unit of seconds and knowing the movement of the second hand 1 is 1 second; Master the running relationship between minutes and seconds, 1 minute =60 seconds.

2. Through observation, operation, cooperation and communication activities, help students initially establish specific concepts of minutes and seconds, and cultivate students' cooperative consciousness and observation and practice ability.

3. Infiltrate students' patriotic education with life examples and colorful practical activities, and cultivate them to form a good habit of cherishing time.

Teaching focus:

Establish the specific concept of second, and summarize the second hand and minute hand through observation and cooperation. The running relationship is 1 min =60 seconds.

Teaching difficulties:

Experience the length of 1 min 1 sec in the activity. Thus, the specific concept of minutes and seconds rose from perceptual knowledge to rational knowledge.

Teaching preparation:

Teaching aid preparation: teaching courseware, clocks and watches in kind.

Preparation of school tools: each student prepares a clock.

Teaching process:

First, create a situation to stimulate interest

1, the courseware presents a scene saved in the Spring Festival Evening. People wait for the moment when the New Year bell rings by counting down, and introduce a new lesson-measuring a short time often requires a smaller unit: seconds.

2. Where else do you use time units and seconds in your daily life?

3. Do you know what seconds are? What else do you want to know?

Second, explore new knowledge in independent cooperation and exchanges.

1. Observe the clock face independently-the second hand is the fastest way to communicate your findings with your deskmate, which leads to a long and thin walk.

2. Explore the running relationship between minutes and seconds in cooperative learning.

① Practice in groups of four. Two people watch the change of the minute hand and two people watch the movement of the second hand.

② Report the running results of minute hand and second hand.

③ Summary: The second hand takes one lap, that is, 60 squares, and the minute hand takes one square.

Blackboard: 1 =60 seconds

Third, experience time in activities and perceive the value of time.

1, listen (1 tick)

2. Take a picture (feel the length of one second)

3. Do it (let the students freely play what they can do in 1 sec, that is, express 1 sec with actions).

4. Read (1 sec brings great wealth to society) the moral education that cherishes time.

5. Estimate the activity of a point.

Activity 1: When the teacher says to start, close your eyes. Every student estimates that one minute is up. Open your eyes, look at the time on the big screen and sit down.

Activity 2: Clap your hands and count.

The whole class looked at the clock in the courseware, accompanied by ticking, clapping and counting, and felt the length of a point in various senses.

Activity 3: Estimate the playing time of an animation.

6. Have fun (1 minute)

One minute, let the students choose their favorite activities to complete.

Report: One minute by myself.

Fourth, consolidate practice, apply new knowledge and solve problems.

1, I'll fill in (courseware)

We used 40 () last class.

(2) Xiao Dan ran 50 meters with 9 points ().

③ Mom works 8 () every day.

It takes about 20 () to get home from school.

I will be the referee.

Think about it, who will get home first? (courseware)

Lele Rabbit: It was 1: 59: 56 when I got home, and Youyou Rabbit: It was 1: 59: 58 when I got home.

Verb (abbreviation of verb) extracurricular expansion

1, understand the history of watch development.

2. Understand the ancient timing method in China.

Six, homework design (free topic)

1. You can surf the Internet or consult books, or you can investigate people around you or yourself to see what you can do in one minute.

2. Record the time required to complete the homework.

3. Accumulate celebrity stories and aphorisms about cherishing time.

4, reasonable arrangement, form a personal schedule.

Model essay on the teaching plan of "understanding of seconds" in the third grade of mathematics in the second primary school

Understanding of Seconds is the first experimental textbook for the third grade of compulsory education curriculum standard published by People's Education Press. Before this, students have had a certain perceptual experience of time and can correctly confirm when to read. The textbook of this lesson pays attention to students' life experience from material selection to presentation, and strives to understand the meaning of seconds in actual situations and explore the relationship between minutes and seconds. Teaching objectives:

1, let the students know the time unit second, and know that 1 minute =60 seconds.

2. Ask students to establish the concept of 1 minute 1 second.

3. Experience the practice of mathematics and life, infiltrate the education of cherishing time, and educate students to cherish every minute.

Analysis of learning situation: students already know the clock and know that 1 is 60 minutes, but may not know the second, so in teaching, let students experience 1 second and a few seconds until 1 is 60 seconds.

Teaching focus:

1, perception 1 =60 seconds.

2. How long is the experience of1second?

Preparation of teaching AIDS: multimedia courseware, clocks and watches

Teaching process:

First, create a situation

The courseware shows the opening ceremony of the Olympic Games, and the dubbing shows the countdown 10- 1.

The teacher asked: Who knows what the countdown to 10- 1 just now means?

The teacher refers to the short-term clear memory, and needs to use the unit with a smaller score-second, prompting the topic: the understanding of seconds.

Second, explore new knowledge:

1, seconds in life.

Students give examples (with pictures, Liu Xiang won the championship12second 9 1, traffic lights).

(1) Think back to the clock face that we all know (12 large grid, 1 large grid has five small grids, the hour hand goes large grid, the minute hand goes small grid, and the hour hand is long and the minute hand is short. )

(2) What do you all know about seconds (seconds go 1 is 1 second, 1 minute =60 seconds, seconds go 1 is 5 seconds and so on. )

(3) The courseware shows the clock model for verification.

How does the clock tell you how many seconds have passed? (Knowing that the second hand and the second hand go 1 is 1 second)

Description: Second hand time 1 sec.

Show and ask: "How many squares did you walk from 12 to 1? Has it been a few seconds? "

How many squares did the second hand go from 12 to 3? How many seconds did it take? "

"The second hand from 12 to 6? Back 12? "

Show the second hand walking once again, prompt students to observe what happened to the minute hand, and ask questions:

"The second hand started from 12 and returned to 12, leaving 1 circle. How much did the minute hand go? "

"How many seconds has the second hand gone 1 lap?" (60 seconds).

"How many seconds is 1?"

Teacher writes on the blackboard: 1 =60 seconds.

2. Listen and feel the length of 1 s.

(1) courseware demonstrates the "tick-tock, tick-tock" sound when the second hand goes. Attendance 1 sec. 2 sec.

(2) Estimate10s,15s.

The courseware demonstrates the "tick-tock, tick-tock" sound of the second hand again (the sound gradually disappears). Students close their eyes and estimate in their own way. When they think it is the time appointed by the teacher, they open their eyes and compare the clock on the courseware to see if they feel accurate.

3. Feel the length of 1 minute.

A, close your eyes and feel 1 (the big screen demonstrates that the second hand walks around the track and dubs, and the sound gradually fades to nothing)

B, 1 min Read the passage (educate students to cherish time)

C, 1 minute to do math problems

D, 1 minute?

4. The history of clocks and watches (introducing ancient timekeeping tools, such as "sun gauge" and "sculpture")

Analysis: Let students experience a period of time with the help of activities and establish a correct concept of time. First, let students experience the length of 1 second and 1 minute through activities such as clapping, counting, writing and drawing. When experiencing 1 minute, let students experience the same 1 minute and feel different when doing different things. This helps students to establish a correct concept of time, while paying attention to cultivating students' awareness of cherishing time.

Fourth, the class summary:

Teacher: What did you learn today? What else don't you understand?

Model essay on the teaching plan of "understanding of seconds" in mathematics in the third grade of primary school

Teaching goal: 1, knowledge goal: let students know the time unit second, and know that 1 minute =60 seconds. Make students initially establish the time concepts of 1 minute and 1 second. Develop the consciousness and habit of observing and cherishing time.

2. Ability goal: through various learning activities, cultivate students' mathematical thinking, language expression ability and cooperation consciousness. Cultivate students' observation and analysis ability and hands-on operation ability, so that students' thinking can be developed.

3. Emotional goal: In observation, comparison and hands-on operation, cultivate students' spirit of being brave in exploration and self-learning, perceive that mathematics comes from and is used in life, understand mathematics and its value, become curious about mathematics, and gain successful experience in solving problems with knowledge. Help students to establish the concept of cherishing time.

Key points and difficulties:

1, let the students know that 1 min =60 seconds.

2. Make students initially establish the time concepts of 1 minute and 1 second.

Teaching process:

First, create a situation and review the introduction.

Teacher: Students, there is a space hero in our hometown. Do you know who he is?

(Nie Haisheng) Students, look at him (showing pictures and moments of Nie Haisheng's war). This is the moment when Nie Haisheng and his companions are about to go to heaven. What time is it now? (indicate the date of birth)

Teacher: At 7: 35, Nie Haisheng and his teammates waved goodbye to their motherland and family, and proudly and confidently entered the spaceship. The courseware shows the pictures and time when the spacecraft is about to launch. ) What time is it now?

Teacher: When the hero is ready, the spaceship will catch fire. Let's review the exciting moments together (the countdown video is played before the spacecraft ignites, 30 seconds to prepare, 20 seconds to prepare, 10, 9...2, 1, and ignite).

Teacher: A new time unit-second appeared in the scene just now. In our daily life, to measure a short time, we need to use a unit smaller than time and minutes-seconds. Today, let's learn about seconds (hint topic: understanding of seconds).

[Design Intention: "Mathematics Curriculum Standards" advocates that mathematics teaching should proceed from the reality of students' lives, and let students perceive and learn mathematics from familiar things through interesting and meaningful activities. "Time" seems to be a cliche, but it is an abstract concept for middle school students, which is not easy to understand. Taking Nie Haisheng, a hometown hero that students are familiar with and admire, as the introduction, the natural transition from what they have learned to new topics not only aroused students' interest in learning, but also paved the way for guiding students to gradually form a systematic concept of time. ]

Second, cooperative inquiry, learning new knowledge

1, I know 1 sec.

Teacher: Although the second is a unit for measuring short time, it plays a great role in our life. Where have you seen seconds? Traffic lights on the road, timing of athletes' competitions, etc. )

[Design Intention: Mathematics serves life and learns mathematics from life. Looking for seconds in life, let students feel that seconds are closely related to our lives, and seconds have its role in life. ]

Teacher: Seconds play a great role in life. What do we use to measure seconds?

According to the students' answers, show all kinds of timekeeping clocks.

Understand secondhand and discover the characteristics of secondhand. Of the three hands on the clock face, the second hand is thin and long, and it goes fastest.

Teacher: Look at the clock and tell me what information you can find about seconds. (According to the students' answers, the second hand moves 1, which means 1 sec. ) The courseware shows that the second hand moves 1. How long is it?

The courseware shows the second hand from 12 to 1. How many seconds is this?

The courseware shows the second hand from 12 to 6. How many seconds is this?

The courseware shows the second hand from 1 to 5. How many seconds? what do you think?

The courseware shows that the second hand is from 12 to 5, which is 2 squares more. How many seconds?

The courseware shows that the second hand has 3 squares from 6 to 1 1. How many seconds?

How many seconds did the courseware display from 12 to 12?

Student activities: Students work in pairs, move the second hand for one life, tell the time for another life, and then exchange.

[Design Intention: "Mathematics Curriculum Standard" points out that it is an important way for students to accumulate mathematics activities by focusing on specific learning content and designing effective mathematics inquiry activities so that students can experience the process of mathematics development. The perception of 1 second and the establishment of the specific concept of second are the key and difficult points of this course. Therefore, by showing the movement of the second hand through multimedia, students can know the time of a few seconds and know the seconds interactively. A variety of experience ways to help students establish the concept of "second"]

2. Know that 1 min =60 seconds.

Teacher: We already know that the second will go 1 and the second hand will go 1. How many seconds?

Teamwork: Watch the clock. Second hand goes 1 lap. What about the minute hand?

Theory pointing to life.

It is concluded that the second hand goes 1 turn, which is 60 seconds, and the minute hand goes 1 grid, which is 1 minute. 1 min =60 seconds.

[Design Intention: The acquisition of mathematical knowledge must be based on one's own observation and thinking. It is a valuable operation and thinking activity for students to observe the relationship between minutes and seconds by themselves.

Third, the activity experience, feeling that time is precious

1, feeling 1 sec

Teacher: How long is 1 second? Let's close our eyes and experience it. what do you think? (courseware second hand time 1 sec. )?

Teacher: 1 sec What can we do? (The teacher plays 1 sec, and the students try to do it. )

Students report what they can accomplish in 1 sec.

Teacher: We blink, clap our hands, read a sentence, and so on. Within 1 sec, what can we do in life and production within 1 sec?

Courseware: 1 sec, cheetahs can fly 28 meters on the grassland.

Hummingbirds flap their wings 55 times,

The fastest growing bamboo in plants is 10 micron long.

The Three Gorges Power Station 1 sec can generate 2700 kWh.

The car runs 20 meters 1 sec.

Shenzhou VI spacecraft 1 sec flight 7. 8 kilometers,

Within 1 s, the global afforestation area is about 14 14 square meters. ...

Teacher: What do you think of watching 1 second in life?

2. Experience 1 min.

Teacher: 1 sec plays a huge role in life and production, so we can't underestimate this short time. So how long is 1 minute? Come and experience it. (The teacher plays Tick-tock 1 minute, and the students observe quietly. )

Talk about your feelings.

Game activity: Try to recite the word 1 minute. Compare who remembers more.

[Design intention: Use the activities and pictures that students like to show the role of guiding students to feel for a short time. Make students feel that 1 sec and 1 min are short, but precious. It is minutes that make up the long river of time. As long as we put our heart into it, we can also create miracles in our study time. We should form the habit of cherishing time from childhood. ]

Fourth, consolidate and expand in combination with reality.

1, little referee

Not long ago, the school held a sports meeting, which was the result of four male students running 50 meters in grade three.

Statistical table of boys' 50-meter running results in grade three

The teacher wants to ask you to be small judges, judge who is the champion and give your reasons. What other questions can you ask?

2. Exercise 14, question 1. Students finish independently and revise collectively. Time unit, I will use it.

Xiaohua sleeps 9 times a day (), watches cartoons 30 times a day, eats 20 times a day, wears a red scarf about 20 times (), Xiaoming runs 50 meters 12 (), skips rope 10 7 times () and does eye exercises about 5 times ().

3. Exercise 14, question 6,

Fill in the appropriate time unit:

4. Class summary.

Teacher: Today, we met a small member of the time family, Sec, and felt the importance of time. What have you gained in these forty minutes?

[Design intention: comb the knowledge to make it organized and systematic; Sublimate thinking, improve thinking ability and pave the way for the next class. ]

Homework:

Tell your parents what you learned today.

② What can you do with 1 sec in your life?