Know more about handwritten newspapers

1, counting unit: one (one), ten, one hundred, thousand, ten million, etc. , are counting units.

2. Number of digits: single digit, ten digit, hundred digit, ... billion digit, etc. , are all numbers. A digital name is to add a "bit" after the corresponding counting unit, such as? One million people.

3. Series: unit level, million level, billion level ... are all digital levels, and a digital level includes four numbers.

4. Number sequence table: A table containing several levels, numbers and corresponding counting units is called a number sequence table.

5. Digital representation: the number on a number represents several counting units of the number. ?

For example, 2 in 12367 is in thousands, which means "2 thousand".

6. How to read large numbers? Grading first, reading from high to low according to several levels, and adding the counting unit of that level after reading each level. ?

7. Reading notes: "2" is pronounced as "2"; If the highest digit of a large number is ten digits, one hundred thousand digits, one billion digits ... and the highest digit is "1", this "1" will not be read. For example, 125046 is pronounced as "125046".

8. Writing of large numbers: Find the counting units of several grades (grades are indicated by dotted lines), write numbers from high to low according to grades, and use "0" for grades or numbers without numbers.

9. Notes on writing numbers: Be sure to pay attention to the "four-digit level", ensure that each level has four digits, and use 0 to make up for the deficiency.

10, reading and writing number test method: the reading and writing numbers can be checked with each other, that is, after reading, write it out and compare it with the original number, and then read it by yourself.

1 1. Write numbers: write the numbers of each part separately, and then make up with 0.

12, comparison of large numbers: the comparison method of large numbers is the same as before. First, align the numbers, and the larger the number, the larger the number; If the numbers are the same, compare them from the highest number to the right.

13. Rounding method: a method to find the "divisor". First, determine the number of digits that need to be accurate, take the digits after it as "mantissa", and choose the digit with the highest mantissa. 0~4 means "give up" and 5~9 means "enter". Add 1 to the precise digit.

For example12,5933? (accurate to ten thousand places) ≈? 65438+300,000

Note: the result after rounding is approximate, so the symbol must be ""!

14, rewritten as numbers with different counting units:

(1) Integer number of ten thousand and hundreds of millions: rewrite four zeros of a level as "ten thousand" and eight zeros of a level as "hundreds of millions".

Like what? 1.5 million = 1.5 million, 240 million = 240 million = 2.4 billion? 370,000 = 3.7 million

Note: the rewriting of tens of thousands and billions of integers is an exact number, so use "=" to connect them!

(2) Rewriting a non-integer into a number with the unit of "ten thousand": take the number after ten thousand digits as the mantissa, round the highest digit (thousand digits) of the mantissa, and then rewrite it into a number with the unit of "ten thousand".

For example,14,7283, because the number on thousands is 7, which belongs to the situation of "entering", so

14,7283 ≈ 15,0000? = 15000 or directly written as14,7283 ≈15000.

(3) Rewriting a non-integer into a number with the unit of "100 million": take the number after 100 million digits as the mantissa, round the highest digit (10 million digits) of the mantissa, and then rewrite it into a number with the unit of "100 million".

For example, 56,0384,965,438+082, because the number on the tens of millions of digits is 0, which belongs to the situation of "giving up", so

56,0384,9 182 ≈ 56,0000,0000? =? 5.6 billion or is it written directly? 5603849182 ≈ 5.6 billion

Author: Qing Xi

Link: /p/cbdb7 1d59259

Source: Jane books

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