Language Tips

Get expert tips on language, grammar, style and vocabulary

How to Write Numbers in English | Student Tips

3 min read
12 February 2021
teacher explaining something in a classroom

Writing numbers can be tricky when you have to do it in letters and essays. There are a few rules that can help you know whether to write just the numbers, or to spell them out.

Here are some easy rules to help you along:

  1. In English, we write numbers starting with the largest digit
    This is just the basics, but when we're writing or saying numbers, we start with the highest value digit first. So 21 is written as "twenty-one" (not "one-and-twenty" as it is done in many languages).
  2. Write single numbers out.
    Use digits (the numbers from 0 - 9) for longer numbers. So for "8" you would write "eight", but for "213" just write the numbers out. If you need to use two words to write a number, then it's probably better to just write out the digits.
  3. The Decimal Comma
    In English, we use a comma as a decimal space, rather than a period (full stop) or a space. So one thousand five hundred is written as 1,500. We use a period to indicate a fraction of a number. For example, one and-a-half would be written as
  4. Don't start sentences with a number
    It just makes using capital letters difficult.  So instead of saying "400 tickets were sold" we would say, "Supporters bought 400 tickets."
  5. Dates should be numbers, but centuries and decades should be written out
    So we would write "1980", but talk about "the eighties" or "the twentieth century".
  6. For really big numbers, a combination of digits and words is okay
    So 100,000,000 would normally be written as "100 million" - it's easiest to read and understand.
  7. Decide how you will write numbers, and stick to it
    It's usually up to you how you want to write numbers, but the important thing is to be consistent.  So if you start writing them out in words, then you need to stick to that for the rest of your letter or essay.


Don’t miss a thing!
top view people hands

Stay up to date on everything Kaplan with our newsletter


  • English

    Secure a deeper understanding of the English language

  • Grammar

    Advance your grammar skills with our simple tips 

Share this article