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Large numbers can be difficult to understand. Keep them simple, and round them where possible. Use your judgment for what’s best in a given situation, but as a rule of thumb:

1 – 30: do not round
30 – 100: round to the nearest five
100 – 150: round to the nearest 10
150 – 500: round to the nearest 25
500 – 1000: round to the nearest 50
1000 – 1 million: round to the nearest hundred

Comma separators are optional for four-digit numbers, but necessary for numbers with five or more digits.

For numbers above 1 million, use numerals and spell out “million,” rounding off to the hundred thousand (e.g., “5.2 million” for “5,190,458”). Follow the same pattern for billions, trillions, and so on.

Abbreviate “million” only if talking about large amounts of money (e.g. “$5.2m”), otherwise it looks like “meters.”

“Bajillion” is not a real number, no matter how much it should be.

Example

Avoid: Digital Key has been used by 3,803,002 guests at 2,456 hotels.
Try: Digital Key has been used by 3.8 million guests at 2500 hotels.