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How long does it know? Mathematical tabloid
How much time do you know? The contents of the mathematical tabloid are as follows:

1, 1 =(60) points.

2. There are (12) numbers on the clock face. Divide the clock face into (12) equal grids, and each grid is divided into (5) equal grids, and there are (60) grids on the clock face.

There are (2) hands on the clock face. The shorter needle is called (hour) needle, and the longer needle is called (minute) needle. When the minute hand walks at 1, it is (1) minutes, when the big hand walks at 1, it is (5 minutes), and when the hour hand walks at 1, it is (1). Minute hand from 12 to 6, go (30 points); The clockwise clock went from 12 to 6, and walked for (6) hours; Clockwise hand made a circle from 12, then returned to 12 and left (12).

4、(? 30) minutes can also be said to be half an hour, and (15) minutes can also be said to be a quarter of an hour. For example, 8: 30 is 8: 30, and 9: 00 15 is 9: 15.

At 5 o'clock (3 o'clock or 9 o'clock), the hour hand and the minute hand on the clock face are at right angles.

Time unit relationship

1. The time for the earth to make one revolution around the sun is called one year.

Second, the average annual rule 1 is 365 days.

3. A leap year is usually a multiple of 4 in the Gregorian calendar year, but the Gregorian calendar year is a whole hundred, and it must be a multiple of 400 to be considered a leap year.

There are four quarters in a year, January, February and March are the first quarter, April, May and June are the second quarter, July, August and September are the third quarter and October, November and December are the fourth quarter.

There are 12 months in May, 3 1 day in January, Wednesday, Friday, July, August, October and December, 30 days in February, Thursday, Saturday, September and November, 28 days in February in normal years and 29 days in February in leap years.

A month in June and October is divided into three days: morning, noon and evening, with the first day from 1 to 10, the middle day from 1 1 to 20, and the last day from 2 1 to the end of the month.

7. Minutes 1 day (day) =24 hours, 1 hour =60 minutes, 1 minute =60 seconds.

Eight, 24 o'clock timing method The timing method from 0 to 24 o'clock is called 24 o'clock timing method. It starts at 0: 00 p.m. 12, then 1 2 … until noon 12, then 13 and 14 p.m. … and then at 24: 00 p.m. (that is, at 0: 00 the next day).