Do numbers need commas?

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Tags

1. #separate
2. #periods
3. #digit
4. #every
5. #place
6. #after
7. #third
8. #comma
9. #decimal
10. #european
11. #countries
12. #three
13. #commas
14. #spaces
15. #blank
16. #digits
17. #point
18. #numbers
19. #right