YYY knowledge 1. YYY knowledge.

Introduce the knowledge about years, months, days and other time units, so that students can understand the years, months and days of time units by observing the almanac, and then introduce the judgment methods of flat years and leap years, as well as the fist memory method (135780, thirty-one days is not bad) and the big moon song memory method, and finally calculate the number of days in the flat years and leap years. Everyone has this common sense. The solar calendar can be divided into months and months. It is the solar calendar month that has such a regulation: "April, June, September and 1 1 have 30 days, and other months have 3 1 day, except February, which has only 28 days." The size of the moon began in Caesar's time in the Roman Empire. At that time, Caesar sent people to modify the calendar, formulate the julian calendar law, and decide which months have special religious significance. 65,438+October has 365,438+0 days, March is in the name of God of War, and July is in memory of Julius Caesar. Because February is an unlucky month for executing prisoners, there are only 29 days. Julius Caesar's successor Augustus's birthday is in August. In order to be on an equal footing with Julius Caesar, he asked to add 365,438+0 days to August. He borrowed another day from February and reduced it to 28 days. In order to avoid connecting the three big months together, he also stipulated that September and 165438+ 10 each have 30 days, and extended 10 and1February to 3 1 day. Gregorian calendar year, leap year is 366 days. Because the earth's orbit around the sun is 365 days, 5 hours, 48 minutes and 46 seconds (365.24 19 days), which is the tropic year, the Gregorian calendar defines a year as 365 days, which is called a normal year. The remaining time is about one day in four years, plus February, so a normal year is 365 days, February is 28 days, and leap year is. Divided by 100 but not divided by 400 is an average year; A leap year is a year divisible by 100 or 400. For example, 2000 is a leap year, and 1900 is not. Because a multi-digit number, if the last two digits can be divisible by 4, then this number can also be divisible by 4, so you can judge it by dividing the last two digits of the year by 4. For example, 19. Use 98 ÷ 4 = 24...2, so 1998 is the normal year. If it is a hundred years, divide the first two digits of the year by 4. (Divider and divisor are reduced by 100 times at the same time, and the quotient remains unchanged. ) For example, is 2400 a flat year or a leap year? Use 24÷4=6, so 2400 is a leap year. February is neither a big moon nor a small moon. This is a special month. Usually, a year with 28 days in February is called a flat year, and a year with 29 days is called a leap year.

2. Knowledge about the year, month and day

Original publisher: love YBBFHWPYU

Knowledge about year, month and day [knowledge points] 1, know big month, small month, normal year and leap year; 2. Calculate the number of days in the past; [Memory] Years are divided into flat years and leap years; Month is divided into big month, small month and special February. There are 365 days in a normal year and 366 days in a leap year. (The big months are: 65438+ 10, March, May, July, August, 65438+ 10, 65438+February (7); Abortions are: April, June, September, 165438+ October) (4) February in a normal year has 28 days, and February in a leap year has 29 days. 2. The consecutive months are July and August, or 65438+February and 65438+ 10. The number of days in two consecutive months is 6 1 day, one of which is a big month and the other is a small month. 3.4.5. Various festivals: 1 October New Year's Day 1, March Arbor Day 12, May International Labor Day 1, June International Children's Day 1, August Army Day1,and July Party Day. 6. Usually there are three normal years and 1 leap year every four years. The Gregorian calendar year is a multiple of 4, usually a leap year. Gregorian calendar year is an integer, and it must be a multiple of 400 to be a leap year (AD 800, 1200, 1600, 2000, 2400, etc. Memory: People's Republic of China (PRC) was founded in 1949, 10, 1, and 2008 will be the 59th anniversary. (2008-1949 = 59) 8.1-100 is the first century, for example, 190 1-2000 is the twentieth century. 9. Calculate the number of days [by month], such as how many days are from June 12 to August 17? Year, month, day, and unit knowledge arrangement (1) 1 year =( 12) leap year =(366) flat year =(365) day (2) Remember big months: 1, 3, 5, 7. Remember the 30 days of abortion: 4, 6, 9, 1 1, 28 days in a normal year, and 29 days in a leap year (3) the method of judging whether it is a leap year: a year divided by 4 without remainder is a leap year, and the remainder is a flat year. (4) The first half: 1-the second half of June: July-65438+the first quarter of February:1,followed by February and March.

What do you know about this date?

Knowledge points: there are 12 months in a year.

There are seven big months: 65438+ 10, March, May, July, August, 65438+ 10, and 65438+February. The two adjacent big months in a year are July and August. There are four kinds of abortion: April, June, September, 165438+ October.

Special February: 28 days in a normal year and 29 days in a leap year. There are usually three normal years and 1 leap year every four years.

If the number of years in the Gregorian calendar is divided by 4 and there is no remainder, it is generally a leap year. The Gregorian calendar year is a whole hundred, and it must be a multiple of 400 to be considered as a leap year.

365 days in a normal year, 366 days in a leap year, the first half of a normal year 18 1 day, the first half of a leap year 182 days, and the second half 184 days. There are 90 days in the first quarter of a normal year (1-March), 9 1 day in the first quarter of a leap year, 9 1 day in the second quarter (April-June), 92 days in the third quarter (July-September) and 92 days in the fourth quarter (1day).

People's Republic of China (PRC) was founded on 1949 10 10/day, and 2049 1 0/day will mark the centenary of the founding of People's Republic of China (PRC). 65438+ 10 1 is New Year's Day, March 3, Love Ears Day, March 5, Learn from Lei Feng, March 8, Women's Day, March 12 Arbor Day, April 4 (or 5), Tomb-Sweeping Day, May 1 Labor Day, June/. September Teacher's Day 10, September 20th Tooth Love Day, June National Day 10, February 3rd International Day for Helping the Disabled 65438+February 25th Christmas.

My birthday is () month (), in the first () quarter; Dad's birthday is () month (), in the first () quarter; Mom's birthday is () month (), in the first () quarter.

4. What do you know about dates?

Open a library member with a minimum of 0.27 yuan, and check the full content > Original publisher: Aiybbfwpyu's knowledge about year, month and day [knowledge point] 1, and know big month, small month, normal year and leap year; 2. Calculate the number of days in the past; [Memory] Years are divided into flat years and leap years; Month is divided into big month, small month and special February.

There are 365 days in a normal year and 366 days in a leap year. (The big months are: 65438+ 10, March, May, July, August, 65438+ 10, 65438+February (7); Abortions are: April, June, September, 165438+ October) (4) February in a normal year has 28 days, and February in a leap year has 29 days.

2. The consecutive months are July and August, or 65438+February and 65438+ 10. The number of days in two consecutive months is 6 1 day, one of which is a big month and the other is a small month.

3.4.5. Various festivals: 1 October New Year's Day 1, March Arbor Day 12, May International Labor Day 1, June International Children's Day 1, August Army Day1,and July Party Day. 6. Usually there are three normal years and 1 leap year every four years.

The Gregorian calendar year is a multiple of 4, usually a leap year. Gregorian calendar year is an integer, and it must be a multiple of 400 to be a leap year (AD 800, 1200, 1600, 2000, 2400, etc. ).

7. Memory: People's Republic of China (PRC) was founded in 1949, 10, 1, and 2008 will be the 59th anniversary. (2008-1949 = 59) 8.1-100 is the first century, for example, 190 1-2000 is the twentieth century.

9. Calculate the number of days [by month], such as how many days are from June 12 to August 17? Year, month, day, and unit knowledge arrangement (1) 1 year =( 12) leap year =(366) flat year =(365) day (2) Remember big months: 1, 3, 5, 7. Remember the 30 days of abortion: 4, 6, 9, 1 1, 28 days in a normal year, and 29 days in a leap year (3) the method of judging whether it is a leap year: a year divided by 4 without remainder is a leap year, and the remainder is a flat year. (4) The first half: 1-the second half of June: July-65438+the first quarter of February:1,followed by February and March.

5. Seek the knowledge points of elementary school mathematics.

1) There are 12 months in a year.

A month with 3 1 day is a big month, and there are seven big months every year, namely 1, March, May, July, August, 10, 12. There are 30 days of abortion in a month, and there are four abortions every year, which are April, June, September, 165438+ 10.

(2) February is neither a big moon nor a small moon. (3) We can record the moon and the moon in two ways: one is fist memory.

(Use the concave and convex edges of boxing joints to practice finger boxing, see book P 18: January and February are not too big, March is big, April is small, May is big, June is small, July is big, August is big, September is small, October is big, November is small, December is big) The second formula is seven months ago. (4) July and August, 65438+February and 65438+1October are consecutive big months.

If the same year is emphasized, then only July and August are consecutive big months. Continuous months add up to 62 days.

A big moon and a small moon add up to 6 1 day. (5) 7 days a week, with at least 4 Sundays and at most 5 Sundays a month.

(6) Add the date every seven days, and the day of the week is the same. For example, June 1 is Wednesday, so June 8 is Wednesday, and June 15 is also Wednesday.

(7) A year with only 28 days in February is a normal year, and a normal year has 365 days. A year with 29 days in February is a leap year and a leap year has 366 days.

There are three normal years and 1 leap years every four years. (8) Usually the Gregorian calendar year is a multiple of 4 (there is no remainder when divided by 4), which is a leap year.

But the Gregorian calendar year is an integer (with two zeros at the end), and it must be a multiple of 400 (divided by 400 without remainder) to be a leap year. Exercise: 1996, 2 100, 1960, 20 10, 2009, 1978, which years are normal years and which years are leap years.

There are four quarters in a year. The first quarter is 65438+ 10, February and March, and the first quarter of a normal year has 90 days.

The first quarter of leap year has 9 1 day. The second quarter is April, May and June, and it is fixed in days and columns every year.

The third quarter is month, month and month, and every year is a fixed day and column. The fourth quarter is month, month and month, and every year is a fixed day and column.

(10) There are 7 days in a week, and 365 days in a normal year have 0 days in a week. In the 366 days of leap year, there are consecutive 10 weeks and 0 days.

6. Knowledge of Year, Month and Day

(1) There are 12 months in a year.

A month with 3 1 day is a big month, and there are seven big months every year, namely 1, March, May, July, August, 10, 12. There are 30 days of abortion in a month, and there are four abortions every year, which are April, June, September, 165438+ 10.

February is neither a big moon nor a small moon (28th or 29th). July and August, 65438+February and 65438+ 10 are consecutive big months.

In the same year, then only July and August are consecutive big months. A year with only 28 days in February is a normal year, and a normal year has 365 days.

A year with 29 days in February is a leap year and a leap year has 366 days. There are usually three normal years and 1 leap year every four years.

If the number of years in the Gregorian calendar is divided by 4 and there is no remainder, it is generally a leap year. The number of years in the Gregorian calendar is an integer, which must be divided by 400 to be a leap year without remainder.

(2) There are four quarters in a year. The first quarter is 65438+ 10, February and March. 90 days in the first quarter of a normal year, 9 1 day in the first quarter of a leap year, 9 1 day in the second quarter, 91day in the third quarter, July, August and September in the third quarter and 92 days in the fourth quarter.

The four seasons we usually say are divided according to the solar terms of the lunar calendar, namely, spring, summer, autumn and winter. Seasons are different from seasons. The four seasons are distinguished according to the change of temperature, and the seasons are distinguished according to the month.

(3) When there are 24 hours in a day, 1, the common time method is also called 12, that is, when a day is divided into two 12, the time period word must be added before the indicated time. (such as early morning, morning, morning, noon, afternoon, evening) 2, 24 o'clock timing method is to divide the day into 24 o'clock, before the indicated time, the prefix of the time period words can be left blank.

3. Common time units are: year, month, day, hour, minute and second. 1 century = 100 1 year = 1 February 1 day (days) =24 hours 1 hour =60 minutes =3600 seconds 1 minute =