Standard form of a decimal

Standard form is the usual way to write the name of a number using digits. When the standard form of a whole number has more than 4 digits, it is usually written with commas separating groups of 3 digits, called periods.

Examples
34  807  2720 (or 2,720)
17,302  1,000,000  2,103,891,762

See also expanded form, period, word form.