10 Common Mistakes When Writing Numbers in Words (and Fixes)
Updated 2026-09-28 · 6 min read
Quick answer
The top mistakes: "one lac" (use "lakh"), "paisas" (use "paise"), dropping decimals in converters, "and" in the wrong place, and mixing lakh with million. Fixes for all ten below.
The 10 mistakes
- "One lac" → "one lakh". "Lac" is informal; financial writing always uses "lakh".
- "Fifty paisas" → "fifty paise". The plural of paisa is paise.
- "One hundred and fifty thousand" → "one hundred fifty thousand". In South Asian formal style, "and" comes only before the final group or paise: "one hundred fifty thousand and twenty paise".
- Missing hyphens: "twenty five" → "twenty-five". Compound numbers 21–99 take hyphens.
- "1 million 50 thousand" → "one million fifty thousand". Never mix digits into the words.
- Mixing systems: "2 lakh 50 thousand dollars" → either "two hundred fifty thousand dollars" (International) or use rupees with lakh/crore.
- Decimal-dropping converters: 125000.50 → 12,500,050. Always verify the paise survived.
- "Rupees one lakh fifty thousand only" left open — without "only", extra words can be appended fraudulently.
- "a hundred" on cheques → "one hundred". Formal documents use "one".
- Capitalizing every word: "One Lakh Twenty Five Thousand" → "One lakh twenty-five thousand" (sentence case, except cheque convention capitalizes the R in "Rupees").
Quick self-check before you submit
- Do the words match the figures exactly?
- Is there exactly one "only" at the end (cheques/documents)?
- Paise written as "and X paise", never as a decimal?
- One system only — lakh/crore OR million/billion?
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Frequently asked questions
Is "one lac" wrong?
On financial documents, yes — write "one lakh". "Lac" is casual spelling.
Where does "and" go in British-style numbers?
Before the last group under 100: "one thousand and fifty". In cheque amounts: "…and fifty paise only".
Should numbers in words be hyphenated?
Compound numbers 21–99: yes — "twenty-one" through "ninety-nine".
Can I write "Rs" instead of "Rupees" on a cheque?
The words line convention starts with "Rupees" in full. "Rs" is for figures only.