1 - unus, una, unum
2 - duo, duae, duo
3 - tres, tres, tria
4 - quattuor
5 - quinque
6 - sex
7 - septem
8 - octo
9 - novem
10 - decem
100 - centum
200 - ducenti, ducentae, ducenta
300 - trecenti, trecentae, trecenta
400 - quadrigenti, quadrigentae, quadrigenta
500 - quingenti, quingentae, quingenta
600 - sescenti, sescentae, sescenta
700 - septingenti, septingentae, septingenta
800 - octingenti, octingentae, octingenta
900 - nongenti, nongentae, nongenta
1000 - mille
2000 - duo milia
See Latin adjectives for information about using the correct form of a number/adjective, and Latin Gender for the 3 genders. Also see: Roman Numerals and Roman Fractions
