Keywords: second grade of leap year primary school in normal years

This article is applicable to: the second grade of primary school.

Composition source:

This 350-word composition is about the second grade of primary school. The title is "Clever Calculation of Flat Years and Leap Years". Everyone is welcome to contribute.

Students, we know that it is very troublesome to judge a normal year and a leap year by dividing the number of years by four every time. Let me recommend a method for you to quickly judge a flat year and a leap year.

Method 1: When the last number of the year is singular 1, 3, 5, 7, 9, this year must be a normal year. Such as: 20, 200315.

Method 2: When the year-end is not singular, look at the last two digits and divide by 4. If there is no remainder, it is a leap year, and if there is a remainder, it is a flat year. For example, 1996, if 96 is divided by 4, it can be evenly divided by 4, and 1996 is a leap year. For example, in 2002, if you divide 02 by 4, it can't be evenly divided by 4, so 2002 is a normal year.

Method 3: When the year is whole hundred, first remove the last two zeros, and then divide the first two digits by 4. If it is divisible by 4, it is a leap year; If it is not divisible by 4, it is a normal year. For example: 1900, divide by 4 with 19, so 1900 is a normal year. In 2800, 28 divided by 4 can be divided by 4, and in 2800, it will be.

This is a leap year.

Students, is this method very simple? As long as you learn this method, it will be easy to judge a normal year and a leap year.

Note: The second method is selected from Happy Mathematics, which shows that the book has its own golden house and the book has its own Yan Ruyu.