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The math time handwritten report is simple and beautiful

Does anyone know the mathematical knowledge on clocks?

(1) The hour and minute hands overlap when they reach the hour, so they overlap 24 times in 24 hours a day. ,

The number of 90-degree angles is twice per hour, totaling 48 times

(2) The minute hand moves once, and the hour hand moves 1/12 times

Starting from 1 o'clock, the minute hand will coincide with the hour hand when it makes x circles

x = 1/12 + x/12 (the distance traveled by the minute hand = the position of the hour hand at 1 o'clock + the distance traveled)

11/12 x = 1/12

x = 1/11

The minute hand moves 1/11 times, which is 60/11 minutes

The knowledge and mathematics story of the year, month, and day that coincides with each other for the first time at 1:60/11 minutes

The knowledge points of "year, month, day" and "year" related knowledge: 1. One year = 12 Month and a half year = 6 months. Ordinary year = 365 days. Leap year = 366 days. 2. Judgment of ordinary years and leap years: Method: There is a leap every four years, there are no leaps in a hundred years, and there are leaps in four hundred years.

For example: 1968 - a leap year, 1954 - an ordinary year, 1900 - an ordinary year, 2000 - a leap year. Judgment method: If the last digit of the year is an odd number 1, 3, 5, 7, or 9, it must be an ordinary year, such as: 2011, 1985... If the last digit of the year is an even number, further judgment is required. There are two relatively simple methods: (1) Check whether the last two digits are divisible by 4, for example: 1928, the last two digits are 28÷4=7, so it is a leap year; another example: 1918, the last two digits are 18÷4=4...2, so it is an ordinary year.

(2) Remember that the special year 2000 is a leap year. Use the year to be judged to find the difference. For example: 1996, 2000-1996=4, 4 can be divided by 4 (it is a multiple of 4), so it is a leap year; another example: 2016, 2016-2000=16,16 Divisible by 4 (is a multiple of 4), so it is a leap year.

3. Calculate the anniversary: ??method: last year - initial year = anniversary. For example: October 1, 2011 is the (62nd) anniversary of the founding of the People's Republic of China. 2011-1949=62 (Anniversary) For example: June 8, 2012 is Xiao Ming’s 9th birthday. In what year was he born? 2012-9=2004 (year) Knowledge related to "month": 1. Big month = 31 days in the whole year *** There are 7 big months Small month = 30 days in the whole year *** There are 4 small months and a half Month = 15 days, February in a balance year = 28 days, February in a leap year = 29 days 2. Methods to determine the big month, small month, and leap month (February): (1) Fist memory method.