1, second hand
The second hand is the tallest and thinnest of the three hands. It goes faster than the minute hand and the hour hand, but it is the smallest unit of time.
Seconds is a smaller unit of time, and seconds are often used to measure a very short time! When the second hand goes once, the time of a small square is 1 second.
It takes 60 seconds for the second hand to make a turn, that is, 60 squares, and it takes 1 minute for the minute hand to make a turn-draw a conclusion: 1 minute =60 seconds. Everyone should remember the relationship between minutes and seconds!
Seconds in life: calculate the time spent by runners in running races, the preparation before rocket launch, the timing of traffic lights at intersections, the speed of hourglass, the midnight countdown of the Spring Festival Evening, etc. There are still many seconds in life, and the baby can observe it in daily life.
How long is 1 sec: 1 sec can blink, 1 sec can bat, 1 sec can jump rope, 1 sec can write a word, and so on. You can do experiments and see what else 1 sec can do.
2. Minute hand
Minute hand: It is not the tallest or shortest of the three hands. This is the second child of the Millennium. Minutes are units of time greater than seconds and less than time. Minute time 1, that is, 60 seconds.
The minute hand walks once, that is, 60 minutes, and the hour hand walks five squares, that is, a big square, and it is concluded that-1 hour =(60) minutes, and the relationship between hours and minutes should also be remembered!
Key points of life: get up and brush your teeth for three minutes, cook for about 20 minutes, eat for 20 minutes, and do oral calculations every day. There are still many points in life. If you are smart, you can observe them carefully.
/kloc-how long is 0/minute? 1 minute can jump rope 70 times, 1 minute can eat a banana, 1 minute can eat seven jiaozi, one minute can write 57 words and so on. In their spare time, young mathematicians can try it.
3, the hour hand
The hour hand is the shortest of the three hands, but it is the largest unit of time, greater than seconds and minutes. It takes 1 for an hour hand to walk a big grid, which is 60 minutes. Remember, the hour hand walks through a big grid.
Time in life: there are 24 hours in a day, students have to sleep for 8 hours every day, and they have 1 hour for a nap in summer vacation. Baby can feel it in life!
4. The relationship between hours and minutes
Time units are: hours, minutes and seconds.
1 =(60) point
1 min = 60 seconds
From big to small: when > minutes > seconds
From small to large: seconds
Did the little experts find that they are all in the middle, whether from small to large or from small to large?
Step 5 consolidate the exercise
2 minutes =( 120) seconds
1 minute =60 seconds, and 2 minutes is two 60 seconds (60+60= 120 seconds).
or
1 minute =60 seconds, and 2 minutes is two 60 seconds.
(Divide by zero: 2×60, calculate 2×6= 12 first, and get 2×60= 120 seconds.)
3 o'clock =( 180) minutes
1 is 60 points and 3 is three 60 points (60+60+60= 180 points).
or
1 =60 points, three points is three 60 points.
(Divide by zero: 3×60, calculate 3×6= 18 first, and get 3×60= 180 points. )
6. Conversion of hours, minutes and seconds in10
Minutes and seconds
1 min =60 seconds? 2 minutes = 120 seconds
3 minutes = 180 seconds 4 minutes =240 seconds
5 minutes =300 seconds, 6 minutes =360 seconds.
7 minutes =420 seconds 8 minutes =480 seconds
9 minutes =540 seconds 10 minutes =600 seconds.
(10 minute =600 seconds, you can think like this: 1 minute =60 seconds, 10 60 seconds is 10×60. Zero elimination method: first calculate 1×6=6, and get 10×60=600 seconds. Be sure to add two zero babies that have been removed. )
Time and minutes
1 hour =60 minutes? 2 hours = 120 minutes
3: 00 = 180; 4: 00 =240.
5 o'clock =300, 6 o'clock =360.
7: 00 =420, 8: 00 =480.
9: 00 =540: 10: 600.
(10 hour =600 minutes, you can think like this: 1 hour =60 minutes, 10 60 minutes is 10×60. Zero elimination method: first calculate 1×6=6, and get 10×60=600 points. Be sure to add two zero babies that have been removed. )