9: Numbers
- Overview
- 9.1Overview and additional resources
- 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
- 9.16Numbers with abbreviations and symbols
- 9.17Units for repeated quantities
- Percentages and Decimal Fractions
- 9.18Percentages
- 9.19Decimal fractions and use of the zero
- Money
- 9.20Words versus monetary symbols and numerals
- 9.21Non-US currencies using the dollar symbol
- 9.22British currency
- 9.23Other currencies
- 9.24Large monetary amounts
- 9.25Currency with dates
- Numbered Divisions in Publications and Other Documents
- 9.26Page numbers, chapter numbers, and so forth
- 9.27Volume, issue, and page numbers for periodicals
- 9.28Numbered divisions in legal instruments
- Dates
- 9.29The year used alone
- 9.30The year abbreviated
- 9.31Month and day
- 9.32Centuries
- 9.33Decades
- 9.34Eras
- 9.35All-numeral dates and other brief forms
- 9.36ISO style for dates
- Time of Day
- 9.37Numerals versus words for time of day
- 9.38Noon and midnight
- 9.39The twenty-four-hour system
- 9.40ISO style for time of day
- Numbers with Proper Names and Titles
- 9.41Numerals for monarchs, popes, and so forth
- 9.42Numerals with personal names
- 9.43Numbers for sequels
- 9.44Vehicle and vessel numbers
- 9.45Numbers for successive governments
- 9.46Numbered political and judicial divisions
- 9.47Numbered military units
- 9.48Numbered places of worship
- 9.49Unions and lodges
- Addresses and Thoroughfares
- 9.50Numbered highways
- 9.51Numbered streets
- 9.52Building and apartment numbers
- Plurals and Punctuation of Numbers
- 9.53Plural numbers
- 9.54Comma between digits
- 9.55The decimal marker
- 9.56Space between digits (SI number style)
- 9.57Telephone numbers
- 9.58Ratios
- 9.59Numbered lists and outline style
- Inclusive Numbers
- 9.60The en dash for inclusive numbers
- 9.61Abbreviating, or condensing, inclusive numbers
- 9.62Alternative systems for inclusive numbers
- 9.63Inclusive numbers with commas
- 9.64Inclusive years
- Roman Numerals
- 9.65Roman numerals—general principles
- 9.66The advent of subtrahends (back counters)
- 9.67Chicago’s preference for arabic rather than roman numerals