TOEIC Link Writing Number and Figure Formatting for Business Writing Conventions: When to Spell a Number and When to Use Digits

In TOEIC Link Writing, how a number appears on the page signals whether a candidate knows business writing conventions. "We received twelve applications" and "We received 12 applications" both state the same fact, but a reader with a business eye expects small counts spelled out in running prose and larger or technical figures in digits. A response that writes "3 people attended the 3 pm meeting" reads as careless about form; one that writes "Three people attended the 3 p.m. meeting" reads as controlled. The numbers are correct in both, but the formatting is part of the register, and a scorer reading for the accuracy and appropriateness of written English notices whether a candidate handles it.

The difficulty is that the rules are conventions, not logic — they cannot be derived, only learned — and they interact. Small numbers spell out, but a percentage takes digits even when small; a sentence should not open with a numeral, but a date is always in digits; two numbers next to each other need a strategy so they do not blur. A candidate who applies one rule everywhere will violate another, and inconsistency within a single response is as visible as an outright error.

This article is the number-and-figure-formatting discipline for TOEIC Link Writing. The guide covers when to spell a number and when to use digits, the standard forms for dates, money, and percentages, and the consistency pass that keeps the numeric style uniform across the response.

When to spell a number and when to use digits

The base convention divides numbers by size and by the kind of information they carry.

Spell out small whole numbers in running prose. In general business writing, whole numbers from one to nine (or, in some house styles, up to ten) are spelled out: "three departments", "seven attendees", "nine revisions". The words fit the flow of prose and match the reader's expectation for small counts. Numerals for these small numbers in ordinary sentences read as informal or as data pulled out of a table into text where it does not belong.

Use digits for larger numbers and for data. From 10 upward (or 11, depending on the cutoff a writer chooses and then keeps), numbers appear as figures: "24 responses", "150 units", "1,200 customers". Digits are also the norm for anything read as data regardless of size — measurements, page numbers, statistics, quantities in a report. "The sample included 8 firms" uses a digit because the number is data, even though 8 is small, and this data-versus-prose distinction is a judgment the writer makes deliberately.

Never open a sentence with a numeral — spell it out or rewrite. "27 people applied" should become "Twenty-seven people applied", or better, rewrite so the number moves off the front: "A total of 27 people applied." A figure at the very start of a sentence is a convention violation across business style guides, and the rewrite that moves the number inward is often cleaner anyway, in the same way that end-weight and given-new ordering improves a sentence by placing heavy material where the reader expects it.

The standard forms for dates, money, and percentages

Certain categories have fixed formats that override the spell-out-small rule, because readers expect them in a specific shape.

Dates and times appear in figures. "The deadline is March 15" and "the meeting starts at 9 a.m." use digits even for small numbers, because dates and clock times are conventionally numeric. A candidate writing "the fifteenth of March" or "nine in the morning" in a business email sounds formal to the point of stiffness; the digit forms are the neutral business default. Consistency in the date style — "March 15" versus "15 March" — should hold across the whole response.

Money and percentages use figures with their symbols. "$5,000", "12%", "€2.5 million" pair digits with the currency or percent symbol, even when the number is small: "a 5% increase" uses a digit because percentages are always numeric in business prose. Writing "five percent" is not wrong, but the digit-plus-symbol form is the expectation in a data-carrying sentence, and mixing "5%" in one line with "twelve percent" in the next is the inconsistency a scorer flags. The same claim-precision that governs quantifier and determiner choice in data statements governs the formatting of the figures those statements report.

Large round numbers may combine digits and words. "2.5 million", "3 billion" pair a figure with a word for readability, rather than writing out every zero. "2,500,000" is correct but harder to read than "2.5 million" in prose, so the mixed form is often the clearer choice for large round quantities. The rule is readability: use the form the business reader parses fastest.

Handling adjacent numbers and keeping style consistent

Two numbers side by side and a mix of forms across a response are the two places numeric formatting most often breaks.

Separate two adjacent numbers by spelling one out. "12 5-page reports" blurs into a single string; "twelve 5-page reports" separates the count from the unit so the reader groups them correctly. The convention is to spell out the first number or the shorter one, whichever keeps the pair readable, so that the reader does not have to guess where one number ends and the next begins.

Keep the same category in the same form throughout. If the response uses digits for percentages, every percentage is a digit; if it spells out numbers under 10, it does so everywhere, not "three departments" in one paragraph and "3 teams" in the next. Consistency within a single response matters more than which permissible cutoff a writer chooses, because the reader reads inconsistency as carelessness. This is the same within-document discipline that register and formality calibration applies to tone: pick the convention and hold it.

Comparable numbers in one sentence take one form. When numbers of the same kind appear together and one of them would normally be a digit, put them all in digits: "We shipped 8 units in April and 24 in May" uses a digit for 8 to match 24, because the two are compared and mixing forms ("eight units in April and 24 in May") reads as inconsistent. Matching the form across a comparison keeps the reader's eye on the numbers rather than on the formatting.

The number-formatting consistency pass

Before submitting, the candidate runs a pass that checks each number for form and the response as a whole for consistency.

Check one: for each number in running prose, confirm small whole numbers are spelled and larger or data numbers are digits. Read the numbers, apply the size-and-kind rule, and fix any small count written as a bare figure in ordinary prose or any large number spelled out awkwardly. This sets the base convention.

Check two: confirm dates, times, money, and percentages are in their standard figure forms, and that no sentence opens with a numeral. Scan for these fixed categories, put them in digits with their symbols, and rewrite any sentence that starts with a figure. This handles the categories that override the spell-out rule.

Check three: read the whole response for one consistent style per category. Confirm every percentage, every count under the cutoff, and every date uses the same form throughout, and that adjacent and compared numbers are separated or matched. This catches the inconsistency that no single-number check would reveal.

A response that passes all three checks presents its numbers in the forms a business reader expects and holds one style from start to finish. That control is what TOEIC Link Writing rewards when it scores the appropriateness of written English, and number formatting — a set of conventions that carry no logic but every bit of professional expectation — is a quiet mark of whether a candidate writes the way business readers read.