Little knowledge of minutes and seconds in grade three

1. How to teach a third-grade pupil to remember in minutes?

It's hard to remember the new words in Grade Two now. I recommend you to use this method:

1, by way of crossword puzzles.

(For example: 24 hours a day, what is 72 hours? It is the word | Crystal |. )

(bite off the cow's tail in one bite. It is the word | Su |). . . . . . You can draw it yourself or look it up online. As long as the image is vivid, it is easy to remember.

2. Use homophonic words.

(for example: planting and cutting, boring and noisy. . . . . )

You ask him to find out the difference between the two words first, and then teach him the difference, so it's easy to remember.

3, with points or up and down.

(For example, the word "dog") You first ask him what the radical on the left is, and then ask him what the word on the right is and what the words on the left and right sides are made of. Gradually he will remember.

2. Seek: ppt teaching plan of "understanding every minute" in mathematics of grade three in primary school.

This is a learning case, and ppt also has it. Please leave your email address and I will send it to you! Evaluation of the name of the third grade of the class: the examiner uses the date of teaching ideas (error correction column), instructions and guidance of learning methods: 1, takes the second and third pages of the question self-study textbook, and outlines the doubts with red pen; Think independently to complete the tasks of autonomous learning and cooperative inquiry, and summarize the laws and methods.

2. In view of the doubts found in autonomous learning, discuss and communicate in groups in class to answer questions. 3. Help students marked with * not to do it.

Learning objective: 1. Let the students know the time unit seconds, and know that 1 min =60 seconds. 2. Make students initially establish the concept of 1 min 1 sec.

Learning focus: understanding the time unit "second", knowing that 1 minute =60 seconds. Difficulties in learning: By observing and exploring the relationship between minutes and seconds, students can collect information about time and cultivate their practical ability.

I. Self-study * 1. Look at page 59 of the textbook. This is the scene of the Spring Festival Evening. Look at the big clock on the wall. Can you tell everyone it's time?

Let's count down:108,52, the New Year bell is about to ring. If we measure a short time like this, we will use units with smaller fractions.

Tell me where time units and seconds are still used. Which clocks do you think can measure "seconds"?

5. There are () squares on the clock face, and there are () squares between every two numbers. *6. When the hour hand turns from one number to the next, it is (). When the minute hand turns from one number to the next, it is (). When the second hand makes a circle, it is (). Second, cooperative inquiry induction demonstration (group cooperation to complete the following questions, a group of display, the rest of the supplementary evaluation. (hint: the minute hand moves, and the second hand moves. The second hand turns and the minute hand goes. )

2. The second hand moves in one second, and the minute hand just moves in a small box, so 1 minute = second. 3. How long is1minute? Please watch the second hand on the clock go quietly.

4. Now we will give you 1 minute. We can draw, write and calculate in 1 minute. 1, 2, and 3 groups of students have to do everything from verbal calculation, drawing, and writing a paragraph, while the students in the fourth group can do whatever they want. )

Although it is short, you can do a lot of things by using it well. Customs clearance test: 1. Fill in the appropriate time units in brackets.

It takes about 20 () to get dressed at 9 () a day, 25( )2 to boil a shell of boiling water, 1 minute for people to jump (), 1 minute for doing () and 1 minute for writing (). 3. Take a deep breath 1 time for () seconds, and you can take a deep breath () times within 15 seconds.

It took () seconds to count from 1 to 30. * 1 minute = () seconds, 120 seconds = () minutes 4. Running around the playground took Wang Gang 59 seconds and Li Yue 1 min 3 seconds. Who is faster? Today we studied seconds and learned that 1 is 60 seconds. We also feel how long 1 and 1 second are. As the saying goes, "an inch of time is worth an inch of gold, and an inch of gold can't buy an inch of time." Students, from now on, cherish every minute and be the master of time! Subject: calculation time, grade three, name evaluation, main candidate: examiner's use date, teaching ideas (error correction column), instruction and learning method guidance: 1. If there are problems on pages 2 and 3 of the self-study textbook, draw the doubts with a red pen; Think independently to complete the tasks of autonomous learning and cooperative inquiry, and summarize the laws and methods.

2. In view of the doubts found in autonomous learning, discuss and communicate in groups in class to answer questions. 3. Help students marked with * not to do it.

Learning goal: 1, so that students can make simple conversion according to 1 =60 minutes and 1 minute =60 seconds. 2. Let students learn some simple calculations about time.

3. Make students learn to arrange their time scientifically and reasonably, and cultivate the good quality of cherishing time. Focus and difficulty: 1, master the simple conversion between time units.

2. Method of calculating elapsed time. 1. Self-study 1, learning example 1. You see the theme figure 2, which is equal to points.

Your idea is; Because 1 is one minute, 2 o'clock is one minute. So 2 o'clock is a minute. 2. Study Example 2. Observing the time displayed on the theme map clock, Xiaoming left home for school. Xiao Ming uses it from home to school.

How to calculate it? . Second, cooperative exploration, inductive presentation (group cooperation to complete the following questions, one group presentation, the rest supplementary evaluation) 1. How much time did Xiao Ming spend from home to school can be calculated as follows: from the minute hand to the walk, each grid was divided into a grid, so it was divided into a grid; You can also think of it this way: subtract, that is, divide.

Check whether your idea is correct by setting the clock. 3. The news broadcast began to end.

Calculate the playing time. Customs clearance test: 1, 3: 00 = () 4: 00 = () 4: 00 = () 3: 00 = () 5: 00 = () 8: 00 = () 2. Xiaohong came to the front of the shop. The shop hasn't opened yet. She saw that the business hours board said that it was open at 9 am and 8 pm. She *3. Physical education class ran 400 meters, Xiao Qiang took 1 min 48 seconds, and Xiao Li took 1 min 54 seconds.

How many seconds did Xiao Li use more than Xiao Qiang? *4. Xiaoming has to walk from home to school 15 points. He should arrive at school at 7:35 every morning. A few minutes before he left home. Self-evaluation: () Group study is really amazing! Observation ability, questioning, cooperative learning topics: time calculation, practice class, grade three evaluation, main preparation: reviewers, date of use, teaching ideas (error correction column), instructions and learning methods: 1, combined with pages 2 and 3 of the problem-based self-study textbook, use red strokes to indicate doubts; Think independently to complete the tasks of autonomous learning and cooperative inquiry, and summarize the laws and methods.

2. In view of the doubts found in autonomous learning, discuss and communicate in groups in class to answer questions. 3. Help students marked with * not to do it.

Learning objective: 1. Consolidate the understanding of time, so that students can further understand some basic knowledge of time units. 2. Let students feel the preciousness of time when learning time units, and gradually form a good habit of cherishing time.

3. Enable students to gradually develop good work and rest habits in the process of making their own work and rest schedules. Difficulties in learning: correctly use hours, minutes and seconds to represent the timetable in life.

Finish the exercise 1 by yourself first, and let the students find out what they have done in 1 second and 1 minute of their lives. .

2. Hours, Minutes and Seconds Exercise ① Which of the following should be accurate to the second? A, launch a rocket. B, B200 m breaststroke. C, eat one.

3. Minute calculation in the third grade of primary school

1. Fill in the time unit in ().

1. I got 40 () in a math class. Xiaohong spent about 4 hours at school in the morning.

2. Xiao Fang uses 1 1 () to jump rope 20 times. Students spend about 6 () hours in school every day.

Grandpa does morning exercises every day 1 (). Xiao Ming spent 20 pounds on dinner.

Dad works about 8 minutes every day. Rebecca ran 50 meters with 10 ().

4. Xiaohui sleeps 9 () every night. It takes Xiao Fang about 5 minutes to get up and get dressed in the morning.

It took five minutes to go from Nanjing to Shanghai by train. The evening news broadcast time is about 30 ().

6. It took 90 () to see a movie. Take a deep breath about 7 ().

7. It took 5 () to walk from the front to the back of the classroom. Summer nap is probably 1 ().

8. Pulse beat 10 times, using 8 (). Running 100 meters needs 13 ().

9. Xiaohong spends 2 () at school in the afternoon. The broadcast time of a TV series is 50 ().

10. When the second hand walks 1, it's () seconds, and walking once is () seconds, which is () minutes.

1 1. The time units we have learned are (), () and (), where () is the smallest time unit.

12. The PE teacher conducted a 50m test on the students in the first group. The results are as follows: Xiaohong took 9 seconds, Xiaoli 1 1 sec, Xiaoming took 8 seconds, and Xiaojun1sec. () runs the fastest and () runs the slowest.

13, measuring a short time, we often use the unit of time with a smaller score as ().

14. On the clock face, the hour hand goes 1 and the minute hand goes (). The minute hand is 1 and the second hand is 1.

15,75 points = () () 240 points = ()

Second, test you.

Xiaoming walks to the library at 7: 40 and arrives at 8: 35. How long has he been gone?

2. Mom spent 180 on clothes and 260 on shoes. Mom, how much is this? How much is the price of clothes more expensive than shoes?

3. There are 78 duck eggs, more than eggs 19 and less than goose eggs 13. How many duck eggs and goose eggs are there respectively?

4. People's Education Edition (2020) exercises and answers for the conversion formula of "hours and minutes" in the first volume of third-grade mathematics.

Original publisher: Li Huijuan.

Time unit conversion formula

1 century = 100 1 year =65438+ February.

The big months (3 1 day) are: 1 month, March, May, July, August,1month,1February.

Abortion (30 days) includes: April, June, September,165438+1October.

February 28th in a normal year and February 29th in a leap year.

There are 365 days in a normal year and 366 days in a leap year.

1 day =24 hours 1 hour =60 minutes.

1 minute =60 seconds 1 hour =3600 seconds.

The progress between two times is 60.

1 hour = 60min 1 minute = 60s 1 day = 24h.

1 quarter = 15 minutes, half an hour =30 minutes.

Time is converted to minutes (multiplied by 60)

Minute to time conversion (except 60)

Minutes are converted into seconds (multiplied by 60)

Seconds are converted into minutes (divided by 60)

Calculate elapsed time: elapsed time = end time-start time.

Exercise of "Time and Points" in the first volume of the third grade mathematics of People's Education Press.

1. The time units we have studied are (), () and (), of which () is the smallest time unit.

2. A * * * on the clock face has () big squares, each big square is divided into () small squares, and a * * * on the clock face has () small squares. The time to walk a big grid clockwise is (); Minute hands occupy a small space (); The time for the second hand to walk the small square is (), and the time for walking the big square is ().

3. An hour hand walks a big grid, a minute hand walks () a small grid, and a minute hand walks () a point; The second hand goes once, and the minute hand goes (), which is ().

4. The clock from the number 3 to the number 9, the elapsed time is (); Minute hand from the number 3 to the number 9, the elapsed time is (); The second hand from the number 3 to the number 6, the elapsed time is ().

5. The minute and second unit test paper of the first volume of the third grade of primary school.

The third grade mathematics first volume unit 5 examination questions

Name: Score:

Please carefully complete the simulation test in this chapter.

First, I will fill in.

148 sec = () min () sec 3 min 12 sec = () sec 90 min = () min 100 min = () min 1 hour = () min.

2 minutes = () seconds 65 seconds = () minutes () seconds 75 seconds = () minutes () seconds.

When 80 minutes = (), () minutes 1 minute = () seconds 3 minutes 2 1 second = () seconds.

2: 00 12 = () 60 = ()

Second, think about it and fill it out.

1, the hour hand walks a big grid, the minute hand walks () a small grid, and the minute hand walks () a point; The second hand goes once, and the minute hand goes (), which is ().

2, clockwise from the number 3 to the number 6, the elapsed time is (); Minute hand from the number 3 to the number 6, the elapsed time is (); The second hand from the number 3 to the number 6, the elapsed time is ().

3. When 8:30:25 is (), () minutes () seconds.

The minute hand walks a small square, and the second hand just walks a small square, which is () seconds.

5, () the hour hand and the minute hand coincide.

6. Half a minute hand is () minutes, half an hour hand is (), and half a second hand is () seconds.

7. When the hour hand goes from 12 to 1, minutes pass (), which is () minutes; The second hand walked 60 squares, and the minute walked () squares, which was () points. The clockwise hand went from () to 6, and walked for 5 hours.

8. It takes () hours for an hour hand to walk from one number to another, and () minutes for a minute hand to walk in a large space.

9, the minute hand from the number 3 to the number 9 is () minutes. 、

10 starts at 9:40 and ends at 10:00. The exercise time between classes is ().

Third, compare sizes.

1 ○ 100 ○ 1 ○ 1 ○ 10 ○ 2 ○ 120 ○300 ○ 3: 5 ○500 ○ 240 ○4 ○4.

10 ○ 1: 6: 36: 7: 70: 40: 04: 250: 04: 150: 02: 03: 0240: 250: 02: 20: 1: 20: 80: 90: 65438.

Fourth, fill in the appropriate units.

1, Yang Yang sleeps 9()2 every day, Xiaoming runs 60 meters, and needs 12 ().

It takes about 5 () days for the school to raise the national flag on Monday. Xiaohua needs about 20 minutes to have breakfast.

5, feel your pulse, 1 () jumped about 80 times.

Verb (abbreviation for verb) calculation:

1 1: 50-7: 40 = 7: 50- 15 =

10: 40 +60 = 12: 10 — 1 1: 40 =

1 1: 30-8: 30 = 7: 00 15 +45 =

2: 50-2: 05 =

Select the appropriate time connection.

1. Xiaoqing runs 60 meters 1 hour.

2. Xiaojun does his homework every day 1 1 sec.

3. News broadcast 20 points

Xiaoming does 30 points of housework every day.

Seven, solve the problem

1, the football match is divided into two halves, the first half is 45 minutes, and the second half is the same as the first half, with an interval of 15 minutes. How long does the whole game take?

The bus leaves every six hours. My mother wants to take the 8:45 bus. When she arrived at the station, it was already 8: 48. How many minutes will she have to wait before taking the next bus?

The party starts at 7:30 pm and ends after 2 hours and 20 minutes of performance. When will it end?