1, publishing houses in Britain and America follow a principle when typesetting, that is, 1 to 10 is expressed in words, and numbers above 10 are expressed in Arabic numerals (some are bounded by 100), which is worth learning.

_ _ Hat table length 10 feet, width 5 feet.

2. If the numbers appear side by side, it's better to keep them unchanged regardless of whether the numbers are less than 10.

_ _ He has four brothers, aged 5, 7, 12 and 15 respectively.

3. Spell the number at the beginning of the sentence.

_ _ 2362 victims were injured.

4. Encounter dates, percentages and special numbers with units, usually Arabic numbers.

_ _ The maximum rotation angle of the workbench is l20.

Numbers between 5.2 1 and 99 should be connected by a hyphen.

Forty-three people were injured in the train accident.

6. When the score is reached, it can be indicated by a hyphen.

_ _ t 1 Two thirds of the class have caught a cold.

7. If the quantity and unit involved are uncertain, it can be expressed in words.

_ _ About five miles per hour (about five miles per hour)

8. Time is usually expressed in numbers.

_ _ His flight takes off at 6:22 a.m.

9. Large numbers are expressed in the simplest way.

_? : 2300 (simpler than 2300)

10, decimal is written as a number.

_ _ This plant grew by 0.9 1 inch last year.

1 1, four or more digits, with commas. Use a comma for every 3 digits, but the digits after the decimal point are not included.

_? 1.054 people

12, when using numbers, put a apostrophe before the number or a apostrophe before s.

In the 1980s and 1990s, the American economy grew.