The Chicago Manual of Style has simplified its capitalization rules in its most recent (17th) edition. For hyphenated compounds, it recommends: ... Capitalize the second element in a hyphenated spelled-out number (twenty-one or twenty-first, etc.) or hyphenated simple fractions (two-thirds in two-thirds majority).

Do you capitalize 3 letter words?

In the AP Stylebook, all words with three letters or fewer are lowercase in a title. However, if any of those short words are verbs (e.g., "is," "are," "was," "be"), they are capitalized.

What are 3 rules for capitalization?