21的英语怎么写

How to Write "21" in English

Writing numbers in English can be a bit of a challenge, especially if you're not used to the language. However, writing "21" in English is quite simple once you know the rules. Here is a guide to help you write "21" correctly in English.

Writing "21" in English

When writing numbers in English, it's important to know that the tens and units places are written separately. So when you write "21" in English, you write "twenty" for the tens place and "one" for the units place. Therefore, "21" in English is written as "twenty-one".

It's worth noting that when numbers are written in words, a hyphen is used between the tens and units places. This is true for all numbers from 21 to 99, such as "thirty-two" and "ninety-nine". However, when numbers are written in digits, there is no need for a hyphen.

Additional Tips for Writing Numbers in English

While writing "21" in English is quite simple, there are a few additional tips to keep in mind when writing numbers in English:

Always write numbers from 1 to 9 as words, such as "one", "two", "three", and so on.

For numbers from 10 to 20, use the special words "eleven", "twelve", "thirteen", and so on. These numbers have unique names and don't follow the same pattern as other numbers.

For numbers from 22 and above, use the pattern of tens and units places as described above. For example, "22" is written as "twenty-two", "37" is written as "thirty-seven", and so on.

When writing large numbers, use a comma to separate groups of three digits. For example, "1,000" is written as "one thousand" and "10,000" is written as "ten thousand".

By following these simple rules, you can easily write any number in English. Whether you're writing a formal document or just sending a text message, knowing how to write numbers correctly can make your writing clearer and more professional.