Romana cifri esas cifro-sistemo la Romani uzis.
La sistemo uzas literi transar la nombri. La Romana cifri esas:
I | V | X | L | C | D | M |
1 | 5 | 10 | 50 | 100 | 500 | 1000 |
E quale konstruktar plu granda nombri (en la plu anciena sistemo):
IIII | V | VIIII | X | XXXXVIIII | L | LXXXXVIIII | C | CCCCXXXXVIIII | D | DCCCCXXXXVIIII | e.c. |
4 | 5 | 9 | 10 | 49 | 50 | 99 | 100 | 449 | 500 | 949 | |
1×4 | 9+(1×4) | 10×4+5+(1×4) | 50+(10×4)+5+(1×4) | 100×4+50+(10×4)+5+(1×4) | 500+(100×4)+50+(10×4)+5+(1×4) |
En plu recente tempi (dum la Mezepoko), la sistemo chanjis:
IV | V | IX | X | XLIX | L | XCIX | C | CDXLIX | D | CMXLIX | e.c. |
4 | 5 | 9 | 10 | 49 | 50 | 99 | 100 | 449 | 500 | 949 | |
5-1 | 10-1 | 50-10+(10-1) | 100-10+(10-1) | 500-100+(50-10)+(10-1) | 1000-100+(50-10)+(10-1) |
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