Grimmer Girl here, since this is my hundredth episode, it seems like a fitting time to talk

about how to use numbers and sentences.

Whether to use a numeral or spell out a number as a word is a matter of style.

For general writing, most guides agree that you should use words for the numbers 1 through

9, but for larger numbers, the rules vary wildly from style guide to style guide.

Some say to use words for the numbers 1 to 100, 1 to 10, any word that can be written

with 1 or 2 words, and so on.

Typically, people who write business or technical documents are more likely to use numerals

liberally, whereas people who write less technical documents are more likely to write out the

words for numbers.

If someone handles numbers a different way than you do, they're probably using a different

style guide, so the best advice I can give you is to pick a style and stick with it when

it makes sense.

Once I used to be a technical writer, I write out the words for numbers 1 through 9 and

use numerals for most other numbers.

Fortunately, some rules about writing numbers are more universally agreed upon than the

general rules I just told you about.

Let's say you're writing about snail development, a technical subject, and you've decided

on the style that says you use words for the numbers 1 through 9 and numerals for anything

bigger.

If you come upon a case where you have two related numbers in the same sentence, you

should write them both as numerals if you would write one of them as a numeral.

...