In must informal correspondence, including emails, writing numbers that are not part of a spread sheet such as "1" or "10" is acceptable. But there are conventions for writing out the numbers in formal writing.
Here are some tips from "Michael" in a blog about rules for
writing numbers.
Great post!
ReplyDeleteI'm always undecided on which is acceptable or not. I will defentially bookmark that website!
Glad it helps!
ReplyDelete