Most style guides call for spelling out numbers less than 10, and using numerals for those 10 and over. While reading a magazine today, I saw the phrase nine out of 10, and it struck me as wrong even though it technically adheres to the standard. It seems like an exception is called for in this case, instead of the distracting mixing of word and numeral. Do style guides address this issue?
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The Oxford Public Affairs Directorate Writing and Style Guide (PDF) says
and gives as acceptable examples
I think this is sensible.
Yes, according to the Chicago Manual of Style I have read recently, the numbering should most importantly be consistent. Then, I believe that it is generally advised to use numerals only for numbers 13 and greater.
Edit: The Chicago Manual of Style, 15th edition, 9.3:
9.6 An alternative rule:
Style guides often suggest using words for numbers below ten, digits for higher values. As @Henry points out, mixing style is not endorsed, but increasingly people are forgetting (or never knew) that caveat...