Numbers of 4 or More Digits to Either Side of the Decimal Point
19.1.1 Numbers of 4 or More Digits to Either Side of the Decimal Point
Commas are not used in large numbers. In 4-digit numbers, the digits are set closed up. For numbers of 10 000 or greater, a half-space or thin space is used to separate every 3 digits starting from the right-most integer (or, in numbers with decimals, from the left of the decimal point). For numbers with 5 or more digits to the right of the decimal point, a half-space is used between every 3 digits starting from the right of the decimal point (see also 18.4, Units of Measure, Use of Numerals With Units).
The exact weight of the salt was 8.453 98 g, but its reported value was rounded to 8.4540 g.
Our analytical sample included all 2455 community-dwelling individuals 65 years or older, representing 32 294 810 elderly persons in the United States.