Commas with numbers

Last Updated : Nov 28, 2013 |
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Use a comma in numbers that consist of four or more digits.
Examples
5,280
80,000
100,000

Exceptions for numeric items that usually do not include commas

Do not use commas in:
  • Numbers that designate baud, such as 9600 baud
  • Numbers that designate a year, such as December 12, 2004
  • Page numbers, addresses, telephone extensions, or decimals
  • Part numbers and product codes
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