### 9: Numbers

- Overview
- Numerals versus Words
- General Principles
- 9.2Chicago’s general rule—zero through one hundred
- 9.3An alternative rule—zero through nine
- 9.4Hundreds, thousands, and hundred thousands
- 9.5Number beginning a sentence
- 9.6Ordinals
- 9.7Consistency and flexibility
- Large Numbers
- 9.8Millions, billions, and so forth
- 9.9Powers of ten
- 9.10“Mega-,” “giga-,” “tera-,” and so forth
- 9.11Binary systems
- 9.12Use of “dex”
- Physical Quantities
- 9.13Physical quantities in general contexts
- 9.14Simple fractions
- 9.15Whole numbers plus fractions
- 9.16Abbreviations and symbols
- 9.17Units for repeated quantities
- Percentages and Decimal Fractions
- Money
- 9.21Words versus monetary symbols and numerals
- 9.22Non-US currencies using the dollar symbol
- 9.23British currency
- 9.24Other currencies
- 9.25Large monetary amounts
- 9.26Currency with dates
- Numbered Divisions in Publications and Other Documents
- 9.27Page numbers, chapter numbers, and so forth
- 9.28Volume, issue, and page numbers for periodicals
- 9.29Numbered divisions in legal instruments
- Dates
- 9.30The year alone
- 9.31The year abbreviated
- 9.32Month and day
- 9.33Centuries
- 9.34Decades
- 9.35Eras
- 9.36All-numeral dates and other brief forms
- 9.37ISO style for dates
- Time of Day
- 9.38Numerals versus words for time of day
- 9.39Noon and midnight
- 9.40The twenty-four-hour system
- 9.41Seconds and dates included
- Numbers with Proper Names and Titles
- 9.42Numerals for monarchs, popes, and so forth
- 9.43Numerals with personal names
- 9.44Numbers for sequels
- 9.45Vehicle and vessel numbers
- 9.46Successive governments
- 9.47Numbered political and judicial divisions
- 9.48Numbered military units
- 9.49Numbered places of worship
- 9.50Unions and lodges
- Addresses and Thoroughfares
- Plurals and Punctuation of Numbers
- 9.54Plural numbers
- 9.55Comma between digits
- 9.56Space between digits
- 9.57Numbered lists and outline style
- Inclusive Numbers
- 9.58When to use the en dash
- 9.59When not to use the en dash
- 9.60Abbreviating, or condensing, inclusive numbers
- 9.61Alternative systems for inclusive numbers
- 9.62Inclusive numbers with commas
- 9.63Inclusive years
- Roman Numerals