We usually use decimal notation. The so-called decimal refers to the relationship between every two adjacent counting units: one large unit equals ten small units, that is, the forward speed between them is "ten".
Counting units should include two parts: integer part and decimal part, which are arranged in the following order: ... one hundred billion, ten billion, one hundred million, one hundred thousand, one hundred thousand, one hundred, ten, one tenth, one percent, one thousandth, ... The integer part has no maximum counting unit, and the decimal part has no minimum counting unit.
When writing numbers, if there is a decimal part, use the decimal point (. ) to separate integers from decimals.
Extended data:
After 1000 billion bits, there are trillions of bits, tens of trillions of bits, hundreds of megabytes, gigabits, Beijing bits, ten Beijing bits, hundreds of Beijing bits, thousands of Beijing bits, four-digit bits, ten-digit bits, hundreds of bits and thousands of bits.
Followed by the thunder level, there are three levels (pronounced Z-, meaning trillions in ancient times), earth level, gully level, stream level, positive level, load level, and "Arithmetic Enlightenment" written by Zhu Shijie, a great mathematician in the Yuan Dynasty (129 1 year).
The contribution of our ancestors in counting has added a glorious page to world mathematics.
When counting, you can use "ten thousand" and "one hundred million" instead of "this", and all the large numbers above "one trillion" are changed to "one hundred million". For example, 5 trillion 403 billion (5,465,438+003,000,000) can be recorded as 5,465,438+003 billion (5,410.3 billion), without trillions of words.
Therefore, few children have achieved more than one trillion yuan. In astronomy, you need to remember a lot of numbers, and use "light years" (light years are the distance that light travels at a speed of 300,000 kilometers per second, the total distance traveled in one year) as the unit!
Counting time unit
This is the one we are most familiar with. Millisecond, second, minute, hour, day and year are counted in different units:
1 sec = 1000 ms
1 min =60 seconds
1 hour =60 minutes
1 day =24 hours
1 year =365 days (normal year) and 366 days (leap year)
Counting unit of stamps
1 piece: it is the smallest unit of measurement for stamps, and refers to stamps with independent functions.
2 sheets: the counting unit of all sheets (including souvenir sheets, sheetlets, sheetlets, etc.). ).
3 printed sheets: refers to printed sheets printed from a printing machine.
4. Post office stamp: The whole stamp printed by the stamp printing factory in the form of finished products is packaged and sent to the post office for sale, which is called post office stamp.
5 grids: according to the requirements of design or printing process, the sub-modules on the printing plate are arranged into several intervals. After printing into stamps, there are several coupons with margins around them, which is called grids. The edge paper between grids is called a bridge.
6 small opening: it is a whole stamp with small size and specifications, commonly known as mini-pane.
Seven-in-one: refers to the combination of at least two stamps after the full-page stamp is torn, and also refers to the state that the stamps are connected without being torn.
Eight-party joint ticket: it is one of the forms of joint ticket. The number of stamps in horizontal and vertical rows is the same, and the neat square is called Lian Fang; The number of horizontal lines and straight lines is different, and rectangles are also called square connections.
References:
Baidu encyclopedia-counting unit