1. Experience how long 1 minute is through the practical activities of "How long 1 minute is".

2. Knowing that 1 min =60 seconds, you can perform simple time unit conversion.

3. Cultivate the ability to solve problems by drawing and other strategies or methods.

Teaching emphasis: let students understand the unit of small fraction-second.

Difficulties in teaching: Understand how long 1 second is, and know the relationship between minutes and seconds.

Teaching process:

First, scene import

1. Xiaoming runs really fast in the sports meeting. It took only 16 seconds to run 100 meters, and 1 was obtained. Xiaohua took 17 seconds and won the second place.

Do you know how long it will take you to run 100 meter alone?

3. What is the time unit we use here? Do you think the second score is bigger or smaller?

Today we will know the smallest unit of time: second (blackboard writing).

Second, understand secondhand.

1. Show me the clock: Which is the second hand?

2. What can you find by observing the match between minute hand and second hand?

3. Student communication: 1 = () seconds.

4. Where have you seen seconds?

Iii. Experience 1 sec

1. Watch the second hand move and clap your hands once a second.

2. Count: Count to 60 and see how many seconds have passed. What is this?

3. deskmate cooperation:

(1) Take a deep breath for () seconds.

(2) It takes () seconds to jump rope 20 times.

(3) It takes () seconds to walk from the front to the back of the classroom.

Fourth, practical application.

1. Fill in the appropriate time unit.

(1) Summer nap is probably 1 ()

(2) It takes about 25 () to eat in a small square.

(3) Pulse beat 10 times, and it took 8 ()

(4) The time of a class is 40 ()

2. Tell the time on the clock and what the students are doing at the moment.

Show the clocks at the same table and talk to each other first, then communicate.

3. Interesting question: It takes three minutes for one person to sing a song, and how many minutes does it take for five people to sing the song in chorus? Let the students guess first, and then try the certificate.

Verb (abbreviation of verb) class summary

What did you learn from this course?

Blackboard design:

1 min =60 seconds

75s = 1 min15s.

1= 30 seconds when 90 seconds.