Writing numbers in words looks simple until you actually have to do it — on a cheque, an invoice, an exam, or a legal document. These small words cause outsized headaches. Here are the ten mistakes I see most often, and how to steer clear of each one.
1. Skipping hyphens in compound numbers
Compound numbers from twenty-one to ninety-nine take a hyphen: twenty-one, forty-two, seventy-six. "Twenty one" without the hyphen is the most common slip, and it can make longer phrases harder to read. When in doubt, hyphenate the compound.
2. Using "and" inconsistently
British English says "one hundred and five"; American style usually drops it: "one hundred five." Neither is wrong, but pick one style and stick with it throughout a document. Switching back and forth looks sloppy.
3. Forgetting commas in large numbers
Write "one million, two hundred thousand" — commas (or the word boundaries they mark) keep large figures readable. Without them, "one million two hundred thousand" blurs together and invites misreading.
4. Saying "decimal five" instead of "point five"
For 0.5, say "zero point five" or "point five" — never "decimal five." Each digit after the point is read separately: 3.14 is "three point one four," not "three point fourteen."
5. Mixing numerals and words in one sentence
"There were 12 apples and twenty oranges" forces the reader to switch gears mid-sentence. Keep it consistent: spell out both, or use numerals for both (house style usually decides which).
6. Writing cheque amounts inconsistently
The words on a cheque's legal amount line must match the figures exactly. If the box says 1,250.75, the line should read "one thousand two hundred fifty dollars and seventy-five cents" — a mismatch can get the cheque rejected or disputed. A free numbers-to-words converter is a handy way to double-check before you sign.
7. Pluralizing hundred, thousand, million
It's "two hundred," "three thousand," "five million" — never "two hundreds" or "five millions." The plural forms only appear when there's no number in front: "hundreds of people," "thousands of cheques."
8. Botching ordinals
It's "twenty-first," "thirty-second," "forty-third" — not "twenty-oneth" or "twenty-firth." Only the last part of a compound ordinal changes form; everything before it stays cardinal ("twenty-" stays put).
9. Capitalizing number words mid-sentence
"Twenty" is only capitalized at the start of a sentence or in a title. Writing "the total is Twenty dollars" mid-sentence is wrong — keep it lowercase: "twenty dollars."
10. Writing cents or paisa without the currency unit
"One hundred twenty-five point seven five" means nothing on its own. Always name the currency: "one hundred twenty-five dollars and seventy-five cents," or "two hundred rupees and fifty paise." The unit is what makes the amount legally meaningful.
Keep these ten rules in your back pocket, and writing numbers in words becomes a habit rather than a hazard. Your cheques, invoices, and exam answers will thank you.
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