When should numerals be used instead of words?

• A. In headlines only.
• B. Always use numerals.
• C. For most data, percentages, measurements; spell out numbers one through nine in text and acronyms; use consistency.
• D. Only in footnotes.

Answer: (C)

The main idea is how to present numbers for clarity and flow in business writing: use numerals for precise data, measurements, and percentages, and spell out small numbers in the running text to keep the prose smooth. Also, stick to one rule throughout the document so readers know what to expect.

Using numerals for most data, percentages, and measurements makes those values stand out and be easy to scan. When you report exact figures—like a data result, a percentage, or a measurement—the numeral communicates precision quickly. For the narrative itself, spelling out numbers from one to nine keeps the text readable and prevents it from feeling choppy with too many digits. Consistency matters too: apply the same rule everywhere in your piece so there’s no reader confusion.

So, this approach balances precision with readability: render quantitative values clearly with numerals, while keeping the prose smooth by spelling out small numbers, and maintain the rule consistently throughout.