1 The rule in plain terms
The core rule is straightforward: spell out whole numbers from zero through nine, and use figures for 10 and above. This applies to general copy, such as 'three cats' and '12 dogs.' The rule keeps prose readable and avoids the visual clutter of numerals in simple text. It also aligns with how people naturally read: small numbers as words, larger ones as digits.
However, the rule is not absolute. It bends for specific categories like ages, percentages, and scores, where figures are always used regardless of size. For instance, 'a 5-year-old child' and '3 percent' are correct. The key is to apply the general rule first, then check for exceptions that override it. Consistency within a sentence or passage is paramount; mixing styles can confuse readers and undermine the copy's professionalism.
Editors enforce this rule to maintain a uniform style across all content. When writers follow it, readers focus on the message rather than the formatting. The rule also simplifies editing, as it provides a clear default that can be quickly verified. In practice, adhering to this guideline ensures that numbers serve the story without drawing undue attention to themselves.
2 Why editors enforce it
Editors enforce number style because consistency signals credibility. When a publication uses '9' in one paragraph and 'nine' in the next, readers may question the attention to detail. A uniform approach to numbers reassures the audience that the content is carefully crafted and reliable. It also prevents ambiguity; for example, '10' is unmistakably a figure, while 'ten' could be overlooked in dense text.
Moreover, consistent number style improves readability. Small numbers spelled out blend seamlessly into sentences, while figures for larger numbers stand out, aiding quick scanning. This is especially important in data-heavy articles, where clarity is critical. Editors also enforce the rule to streamline the editing process; a single standard reduces back-and-forth queries and speeds up publication.
Finally, adherence to a recognized style guide like AP fosters professionalism. It shows that the publication values precision and follows established norms. While the rule may seem minor, its impact on overall quality is significant. Editors know that readers may not consciously notice correct number style, but they will notice errors, which can erode trust in the content and the brand.
3 Where writers usually slip
Writers often slip by mixing spelled-out and figure forms inconsistently. For example, they might write 'She has 2 brothers and three sisters,' using a figure for one number under 10 and a word for another. This inconsistency is jarring and suggests a lack of proofreading. Another common error is using figures for all numbers in a sentence, such as 'I bought 3 apples and 12 oranges,' which violates the rule for numbers under 10.
Writers also forget to apply exceptions correctly. They might spell out ages ('five-year-old') instead of using figures ('5-year-old'), or write 'ten percent' instead of '10 percent.' In technical contexts, they might spell out numbers that should be figures, like 'the value is seven' instead of 'the value is 7.' These mistakes often stem from habit or uncertainty about the rules.
Additionally, writers may struggle with numbers at the beginning of sentences. The rule says to spell out any number that starts a sentence, but writers sometimes use figures, leading to awkward constructions like '12 people attended.' The correct form is 'Twelve people attended.' Editors catch these slips, but preventing them requires writers to internalize the guidelines and apply them consistently.
4 Applying the rule on deadline
On deadline, applying the number rule quickly requires a mental checklist. First, identify the number's context: is it a general quantity, an age, a percentage, a score, or part of a technical measurement? For general quantities, use words for zero through nine and figures for 10 and above. For exceptions, default to figures. Second, check for consistency within the sentence or paragraph; if you use a figure for one number, use figures for all numbers in that category, even if some are under 10.
Third, remember to spell out numbers at the start of a sentence. If a figure is necessary, restructure the sentence to avoid beginning with a numeral. Fourth, in headlines and tables, use figures for all numbers except in casual expressions. Fifth, when in doubt, consult the stylebook or a colleague, but don't let uncertainty delay filing. A quick decision based on the rule is better than a delayed story.
Finally, proofread with number style in mind. A fast scan for digits and number words can catch inconsistencies. With practice, applying the rule becomes second nature, allowing writers to focus on content while maintaining style. Editors appreciate copy that adheres to the guidelines, as it reduces editing time and ensures a polished final product.
5 Legitimate exceptions
The rule has several legitimate exceptions where figures are always used, regardless of the number's size. Ages are a prime example: 'a 3-year-old' and 'the 5-year-old' are correct, not 'three-year-old.' Percentages also take figures: '5 percent' and '10 percent.' Scores and votes use figures: 'The team won 3-2' and 'The bill passed 5-4.' In mathematical or technical contexts, figures are standard: 'The equation is 2 + 2 = 4.'
Other exceptions include dates, times, and monetary amounts. Write 'July 4' and '3 p.m.' and '$5.' For large round numbers, figures are often used: '5 million' and '10 billion.' In tables and headlines, figures are used for all numbers except in casual phrases like 'one of a kind.' When numbers are used in a series, consistency may require using figures for all, even those under 10: 'The recipe calls for 2 eggs, 3 cups of flour, and 1 teaspoon of salt.'
These exceptions exist because figures enhance clarity in these contexts. For ages and percentages, figures are more precise and easier to scan. In technical writing, figures are standard. The key is to recognize when an exception applies and to apply it consistently. Editors should be familiar with these exceptions to ensure copy is both accurate and stylistically correct.
6 A worked example from the copy desk
Consider a draft sentence: 'The event drew 9 participants, including three children and 12 adults.' The copy editor spots two issues. First, '9' should be spelled out because it is under 10 and not an exception. Second, the sentence mixes a figure ('12') and a word ('three') for numbers in the same category (participants). The editor revises to: 'The event drew nine participants, including three children and 12 adults.' Now, 'nine' and 'three' are words, and '12' is a figure, following the rule. But wait: the numbers are all in the same category (counts of people), so consistency might demand using figures for all if any is 10 or above. However, AP style allows mixing if the numbers are not in a direct series. Here, 'nine participants' is a total, while 'three children' and '12 adults' are subsets. The editor could also write '9 participants, including 3 children and 12 adults' to be consistent, but that would violate the under-10 rule for '9' and '3' unless they are in a series. The safest revision is to spell out all numbers under 10 and use figures for 10 and above, even if it means mixing in the same sentence, as long as the numbers are not part of a single series. So the final version stands.
This example shows how editors balance the general rule with consistency and exceptions. It also highlights the need to consider the context and the relationship between numbers. In this case, the editor chose to follow the basic rule, resulting in a clear, correct sentence.
7 Quick reference and related rules
For quick reference, remember: spell out zero through nine; use figures for 10 and above. Always use figures for ages, percentages, scores, dates, times, monetary amounts, and in tables and headlines. Spell out numbers at the start of a sentence. In a series, use figures for all if any number is 10 or above, but this can be flexible if the numbers are not directly related. Related rules include using commas in figures of 1,000 and above, and using 'million' and 'billion' with figures (e.g., '5 million').
Also, use figures for decimals and fractions: '3.5' and '1/2.' For ordinals, spell out first through ninth and use figures for 10th and above: 'first,' 'second,' '10th,' '21st.' When writing ranges, use an en dash with figures: 'pages 10-15.' For negative numbers, use a minus sign: '-5.' In scientific and technical writing, figures are often used for all numbers, but this should be consistent within the document.
Finally, always consult the AP Stylebook for specific cases. When in doubt, prioritize clarity and consistency. Editors should apply these rules uniformly to maintain the publication's style. By mastering these guidelines, writers and editors ensure that numbers enhance rather than distract from the copy.