Where is the instructional design in the third grade?

There are also courseware. Lesson 1: Understanding Seconds.

Learning Objectives: 1 To enable students to recognize the unit of time and seconds, and to know 1 minute and 60 seconds.

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

Learning Focus: Recognize the unit of time "seconds", know that 1 minute = 60 seconds.

Learning difficulty: Let students collect information about time through observation, the relationship between minutes and seconds, and cultivate students' practical ability.

Students in the first group are required to choose any one of the following categories: doing oral arithmetic, drawing, or writing a paragraph.

1. Self-directed learning.

1. Look at page 59 of the textbook, this is the scene of the Spring Festival Gala. Looking at the big clock on the wall, you can tell you that it's the hour. Let's count down together: 10, 8, 5

2 The New Year's bell is about to ring. Measuring a very short period of time like this, we need to use a unit with a smaller score.

3. Tell me where time units are still used.

4. Which clocks do you think can measure "seconds"?

5. There are ( ) cells on the clock face, and every two numbers are ( ) cells

6. The hour hand goes from one number to the next number is ( ) the minute hand goes from one number to the next number is ( ) and the second hand goes around ( ) minutes.

Second, cooperation, induction and display.

2. The second hand goes in circles is seconds, and the minute hand goes exactly in small squares, so that 1 minute and second are obtained.

How long is a minute? Please take a walk quietly** the second hand on the clock face.

4. Now give you 1 minute, 1 minute we can draw, write and calculate.

5. Although it is short, it can do many things with good use.

Pass the test: 1. Fill in the appropriate time unit in parentheses.

It takes about 9 ( ) to sleep every day and about 20 ( ) to get dressed

It takes about 25 ( ) to boil a shell of boiling water

2. People have a pulse beat in 1 minute, do questions in 1 minute, and write words in 1 minute.

3. Take ( ) seconds for 1 deep breath, and take ( ) times of deep breathing within 15 seconds.

It took ( ) seconds to count from 1 to 30.

1 minute ( sec, 120 sec ( min.

4. Running 1 lap around the playground, Wang Gang used 59 seconds, Li Yue used 1 minute and 3 seconds, who is faster?

We learned the understanding of seconds today, knew 1 minute and 60 seconds, and also felt how long 1 minute and 1 second are, as the saying goes: "An inch of time is an inch of gold, and it is difficult to buy an inch of time" Students from now on, cherish every minute and every second, and be the master of time!

4:50 a.m. + 15 p.m. 5:05 a.m.

You are given three equations: start time + elapsed time end time end time start time elapsed time.

End Time Elapsed Time Start time.

The process is as follows: 1 hour = 60 minutes 1 minute = 60 seconds.

If the high-level units are converted from the low-level, multiply by their advance rate;Otherwise, divide by their advance rate.

4:50 a.m. + 15 p.m. 4:65 a.m. (1 hour 60 minutes) So.

5:05 a.m.

4:50 a.m. + 15 p.m. 5:05 a.m.

You are given three equations: start time + elapsed time and end time.

End Time Start Time Elapsed time.

End Time Elapsed Time Start time.

1 minute = 60 seconds.

Let's say 10 minutes = 10 60 seconds = 600 seconds.

If you don't understand, please ask Satisfied.