What is the cheapest way to travel around Paris?

Related questions

1. How do you pay for Metro in Paris?
2. How late is Paris Metro open?
3. Is there WiFi in Paris Metro?
4. Is Paris Metro 24 hours?
5. What time does Metro Stop Paris?
6. What is the difference between Paris RER and Metro?
7. Who built Paris?
8. What is m in Paris?
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10. Is Eiffel Tower included in Paris Pass?

Tags

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2. #bikes
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8. #cheapest
9. #efficient
10. #dayticket
11. #validity
12. #paris
13. #catch
14. #change
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16. #cheap
17. #during
18. #minutes
19. #network
20. #bicycle
21. #around