Numbers are written using a dot “.” as decimal separator and comma “,” as thousands separator. We normally use max two decimals. The number of decimals used should reflect the text's need for accuracy.
The thousands separator can optionally be omitted for numbers 1,000–9,999.
A zero should be included before the dot in numbers less than 1.0.
Very large integer numbers (those above 999,999) should be written using million, billion, or trillion, replacing the last six or nine digits.
Numbers less than ten are spelt out, unless they are dates or part of a list with larger values.
Examples:
The Association has 12,481 members.
The function nesting limit is set to 1000.
That is exactly 99.96% true.
The file has more than 30 million lines.
All of the three million TYPO3 users are geniuses.
I need at least five developers.
Choose between the numbers 4, 42, and 64.
The difference is less than 0.5.