Hyphen In Compound Numbers
When writing a compound number – any number made up of two words – we use a hyphen in between them. This applies to any number between 21 and 99. Numbers higher than ninety-nine don’t require a hyphen.
Fifty-six bottles of pop on the wall, fifty-six bottles of pop….
No, I won’t party “like it’s nineteen ninety-nine”.
This rule applies even if these numbers are preceded by other numbers.
One hundred and thirty-three
Six thousand and seventy-two.
One hundred million, forty-four thousand, nine hundred and eighty-five
The rule also applies if a number between 21 and 99 is being used as an adjective.
Ninety-nine thousand, nine hundred and ninety-nine.
Seventy-five billion dollars is not a lot of money when you’re researching space.
If twenty-two million people died, it would be called “a disaster”; if twenty-two million trees die, we call it “the pulp-and-paper industry”.
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