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Chapter 12.
o. Unit modifiers:
- 5-day week
- 8-year-old wine
- 8-hour day
- 10-foot pole
- ½-inch pipe
- 5-foot-wide entrance
- 10-million-peso loan
- a 5-percent increase
- 20th-century progress
but
- two-story house
- five-member board
- $20 million airfield
p. Vitamins:
B12, BT, A₁, etc.
Ordinal numbers
12.10.
Except as indicated in rules 12.11 and 12.19, and also for day preceding month, figures are used in text and footnotes to text for serial ordinal numbers beginning with 10th. In tables, leaderwork, footnotes to tables and leaderwork, and in sidenotes, figures are used at all times. Military units are expressed in figures at all times when not the beginning of a sentence, except Corps. (For ordinals in addresses, see rule 12.13.)
- 29th of May, but May 29
- First Congress; 102d Congress
- ninth century; 21st century
- Second Congressional District; 20th Congressional District
- seventh region; 17th region
- 323d Fighter Wing
- 12th Regiment
- 9th Naval District
- 7th Fleet
- 7th Air Force
- 7th Task Force
- eighth parallel; 38th parallel
- fifth ward; 12th ward
- ninth birthday; 66th birthday
- first grade; 11th grade
- 1st Army
- 1st Cavalry Division
- but
- XII Corps (Army usage)
- Court of Appeals for the Tenth Circuit
- Seventeenth Decennial Census (title)
12.11.
When ordinals appear in juxtaposition and one of them is 10th or more, figures are used for such ordinal numbers.
- This legislation was passed in the 1st session of the 102d Congress.
- He served in the 9th and 10th Congresses.
