3rd Grade Math Problem There must be three flat years and a leap year in four consecutive years, rig

There must have been three common years in four consecutive years, and one leap year was wrong, and seven consecutive years were common years on the Gregorian calendar.

Leap years (leap

year) was established to compensate for the time difference between the number of days of the year and the actual orbital cycle of the earth caused by the artificial calendar. The year in which the time difference is made up is a leap year.

The Earth's orbital period around the Sun is 365 days, 5 hours, 48 minutes and 46 seconds (conjunction), which is a return year (tropical).

year）。The common year of the Gregorian calendar is only 365 days, which is shorter than the return year, and the remaining time is about one day accumulated in four years, so the four years are added to February by one day, so that the length of the calendar year of the year is 366 days, and this year is a leap year. According to a leap year every four years, an average of more days are counted per year, so that after 400 years there will be about 3 extra days, so that every 400 years there is a decrease of three leap years.

Therefore, it is stipulated that the Gregorian calendar year is a whole hundred, and it must be a multiple of 400 to be a leap year, not a multiple of 400, although it is a multiple of 100, it is also a common year, which is commonly said: a leap in four years, no leap in a hundred years, and a leap in four hundred years. There are 97 leap years for every 400 years in the current Gregorian calendar.

For example, 2000 is a leap year and 1900 is a common year.

Wrong. A leap year is defined as a year that is divisible by 4 but not divisible by 100 or divisible by 400.

1900 was not a leap year.

So it can be seen that there were no leap years in the seven years from 1897 to 1993.

False: Generally, if the year is a multiple of 4, it is a leap year, when the year is a multiple of 100, it is a multiple of 400, and the year is a leap year; That is, there are 97 leap years every 400 years.

leap year

It was established to compensate for the time difference between the number of days of the year and the actual orbital cycle of the earth caused by the man-made calendar. The year in which the time difference is made up is a leap year. Leap years are included in the Gregorian calendar (Gregorian calendar.

Or the summer calendar. There are years with leap days or leap months. Leap years have 366 days.

It is incorrect to say that every four years must be leap years, because there are two conditions to determine whether a year is a leap year or not: one is that the year is divisible by 4.

The second is that the year is not divisible by 100 but can be divisible by 400, for example, 1900 is not a leap year and 1904 and 2000 are leap years. And leap year is a noun in the Gregorian calendar.

Leap years are divided into ordinary leap years and century leap years.

Ordinary leap year: A year that is divisible by 4 but not by 100 is an ordinary leap year. (e.g. 2004 is a leap year, 1999 is not a leap year);

Century leap year: A century leap year that is divisible by 400. (e.g. 2000 is a leap year, 1900 is not a leap year);

A leap year was established to compensate for the difference between the number of days of the year and the actual orbital cycle of the earth caused by the man-made calendar. The year in which the time difference is made up is a leap year. There are 366 days in a leap year (31, 29, 31, 30, 31, 31, 30, 30, 31, 31, 30, 31, 30, 30, 30 and 31 from January to December).

Any year in which there is a leap day (29 days in February) in the solar calendar; Leap more (more than the year is intercalated. the difference in time between the lunar calendar and the return year); Note that there is no direct correlation between leap years (nouns in the Gregorian calendar) and leap months (nouns in the lunar calendar), which are only divided into leap years and peaceful years, with a common year having 365 days and a leap year having 366 days (one more day in February); There may also be leap months in a normal year (e.g. 2017 is a common year, and the lunar calendar has a leap month and a leap month in June).

Causes of leap years:

The earth needs to circle the sun: 365 days, 5 hours, 48 minutes and 46 seconds, because 365 days, 5 hours, 48 minutes and 46 seconds = 365 days and 6 hours, for convenience, there are 365 days in ordinary years, so in order to make up for the difference in time, there are leap years every 4 years, 366 days in leap years, and 29 days in February in leap years. [10]

In the Gregorian (Gregorian calendar) year, a year with a leap day is called a leap year, which is 365 days in a normal year and 366 days in a leap year. Since the Earth's orbit around the Sun is 365 days, 5 hours, 48 minutes and 46 seconds, which is a return year, the Gregorian calendar defines a year as 365 days. The remaining time is about one day over four years, added to February, so that in a normal year there are 365 days per year, 28 days in February, 366 days in leap years, and 29 days in February.

19] Thus, there are 97 leap years in every 400 years, with leap years adding one day at the end of February, for 366 days in leap years.

No, a leap year is a year that is divisible by 4 or divisible by 400, and a year that is not divisible is a common year. Generally every three years is a leap year, but there are exceptions. For example, 1296 is a leap year, and after three years it will be 1300, which is 1300 and not a leap year, because it is not divisible by 400.

It is true that a leap year occurs once every four years, three consecutive years are common years, and the fourth year is a leap year.

A leap year is a leap year every four years, and if three consecutive years are a common year, then the fourth year must be a leap year, which is true.

Wrong. A year divisible by 4 but not divisible by 400 is a leap year.

That's right. Leap years are held once every four years.

Every 4 years, there must be 3 common years and one leap year. For example, 1897, 1898, 1899, 1900, 1901, 1902, and 1903 were all common years for seven consecutive years, which does not conform to the saying that there must be three ordinary years and one leap year every four years.

Leap year. Leap year is a noun in the calendar, which is divided into ordinary leap years and century leap years. There are 365 days in a normal year and 366 days in a leap year (1 more day in mid-February, i.e. 29 days).

Leap years are established to compensate for the time difference between the number of days of the year and the actual orbital cycle of the earth caused by the artificial calendar. The year in which the time difference is made up is a leap year.

There are 366 days in a leap year (31, 29, 31, 30, 31, 31, 30, 30, 31, 31, 30, 31, 30, 30, 30 and 31 from January to December). Content.

It is false to say that one out of every four years must be a leap year. A leap year is a year in which there is one more day or shed than a normal year, and there is a leap year every four years. However, this does not mean that there must be a leap year every four years.

Leap years arise because the Earth's orbit around the Sun is 365 days, 5 hours, 48 minutes and 46 seconds (conjunction), and we usually set a year as 365 days.

Generally speaking, a year divisible by 4 is a leap year, but if it is a century year (i.e., a whole hundred years), it must be divisible by 400 to be a leap year. For example, 1900 is not a leap year because its last day is not February 29, while 1904 is a leap year because it is a century year and is divisible by 400.

Therefore, it is false to say that one out of every four years must be a leap year.