133. These two series are as follows.
| CARDINAL | ORDINAL | ROMAN NUMERALS |
| 1. ūnus, ūna, ūnum one | prīmus, -a, -um first | I |
| 2. duo, duae, duo two | secundus (alter) second | II |
| 3. trēs, tria three | tertius third | III |
| 4. quattuor | quārtus | IIII or IV |
| 5. quīnque | quīntus | V |
| 6. sex | sextus | VI |
| 7. septem | septimus | VII |
| 8. octō | octāvus | VIII |
| 9. novem | nōnus | VIIII or IX |
| 10. decem | decimus | X |
| 11. ūndecim | ūndecimus | XI |
| 12. duodecim, | duodecimus | XII |
|
13. tredecim |
tertius decimus |
XIII |
| 14. quattuordecim | quārtus decimus | XIIII or XIV |
| 15. quīndecim | quīntus decimus | XV |
| 16. sēdecim | sextus decimus | XVI |
| 17. septendecim | septimus decimus | XVII |
|
18. duodēvīgintī |
duodēvīcēnsimus |
XVIII |
|
19. ūndēvīgintī |
ūndēvīcēnsimus |
XVIIII or XIX |
| 20. vīgintī |
vīcēnsimus |
XX |
|
21. vīgintī ūnus |
vīcēnsimus prīmus |
XXI |
| 30. trīgintā | trīcēnsimus | XXX |
| 40. quadrāgintā | quadrāgēnsimus | XXXX or XL |
| 50. quīnquāgintā | quīnquāgēnsimus | ↓ or L |
| 60. sexāgintā | sexāgēnsimus | LX |
| 70. septuāgintā | septuāgēnsimus | LXX |
| 80. octōgintā | octōgēnsimus | LXXX |
| 90. nōnāgintā | nōnāgēnsimus | LXXXX or XC |
| 100. centum | centēnsimus | C |
| 101. centum (et) ūnus, etc. | centēnsimus prīmus, etc. | CI |
| 200. ducentī, -ae, -a | ducentēnsimus | CC |
| 300. trecentī | trecentēnsimus | CCC |
| 400. quadringentī | quadringentēnsimus | CCCC |
| 500. quīngentī | quīngentēnsimus | D |
| 600. sescentī | sescentēnsimus | DC |
| 700. septingentī | septingentēnsimus | DCC |
| 800. octingentī | octingentēnsimus | DCCC |
| 900. nōngentī | nōngentēnsimus | DCCCC |
| 1000. mīlle | mīllēnsimus | ∞ (CIϽ) or M |
| 5000. quīnque mīlia (mīllia) | quīnquiēns mīllēnsimus | IϽϽ |
| 10,000. decem mīlia (mīllia) | deciēns mīllēnsimus | CCIϽϽ |
| 100,000. centum mīlia (mīllia) | centiēns mīllēnsimus | CCCIϽϽϽ |
Note 1— The forms in -ēnsimus are often written without the n:
vīcēsimus, etc.
Note 2— The forms octōdecim, novendecim are rare, duodēvīgintī (two from twenty), ūndēvīgintī (one from twenty), being used instead. So 28, 29; 38, 39; etc. may be expressed either by the subtraction of two and one or by the addition of eight and nine respectively.
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