One Big Mistake in English Writing & Speaking: Five Billion or Five Billions?
Have you ever wondered whether to write five billion or five billions? The answer lies in a simple but powerful rule: when a specific number comes before words like hundred, thousand, lakh, million, billion, dozen, we do not add an 's' — because those words are acting as adjectives, and adjectives have no plural form. When there's no specific number, they often act as nouns and can be plural.
The Simple Rule
Adjective (no 's'): I have five thousand rupees.
Noun (can have 's'): I have thousands of rupees.
• With a specific number → no plural 's' (acts like an adjective).
• Without a specific number → can be plural + 'of' (acts like a noun).
More Examples: Correct vs Incorrect
Billion
✓ The world has a population of almost eight billion people. (correct)
✗ The world has a population of almost eight billions people. (incorrect)
✓ Billions of people live on Earth. (correct)
Thousand
✓ We need 20 thousand dollars. (correct)
✗ We need 20 thousands dollars. (incorrect)
✓ Thousands of dollars were spent. (correct)
✓ My father gave me one thousand dollars. (correct)
✗ My father gave me one thousand dollar. (incorrect)
Million
✓ Millions of people died during World War I. (correct)
✗ Million of people died during World War I. (incorrect)
✓ Your plan saved millions of people's lives. (correct)
Hundred
✓ Hundreds of dogs live in this city. / One hundred dogs live in this city. (both correct)
✗ Hundred of dogs live in this city. / One hundreds dogs live in this city. (incorrect)
✓ Five hundred people died in a train accident. / Hundreds of people died. (both correct)
Dozen
✓ He can eat two dozen boiled eggs on an empty stomach. / He can eat dozens of boiled eggs. (both correct)
✗ He can eat two dozens boiled eggs. / dozen of boiled egg. (incorrect)
Special Note: Dollar & Currency
✓ John gave me two ten-dollar notes. (Here ten-dollar is a compound adjective modifying 'notes'.)
✗ John gave me two ten-dollars notes.
Explanation: ten-dollar acts as an adjective; the noun notes is plural because John gave two notes, each of ten dollars.
🧠 Quick Decision Guide
- Specific number before a word like hundred, thousand, etc. → no 's' (adjective).
- No specific number, talking about an indefinite large amount → plural with 's' + of (noun).
- The word 'dollar' itself is a noun; it becomes plural when the amount is more than one, but when used as a compound adjective (ten-dollar note), it stays singular.
- Class / standard: I'm in class six (not class sixth) or I'm in the sixth standard.
English is a language just like your mother tongue. Listen, speak, read, write, and practice. Keep these patterns in mind, and you'll never confuse five billion with five billions again.
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