Esperanto

Esperanto is allegedly an international auxiliary language, so it handles numbers in a relatively simple way. good luck saying "kvar" though. numbers up to six can stay the same.

  • 0: nul

  • 1: unu

  • 2: du

  • 3: tri

  • 4: kvar

  • 5: kvin

  • 10: ses

multiples of ten are formed with -dek (ten) in Esperanto, so multiples of six can be formed with -ses.

  • 11: ses unu

  • 12: ses du

  • 13: ses tri

  • 14: ses kvar

  • 15: ses kvin

  • 20: duses

  • 30: trises

  • 40: kvarses

  • 50: kvinses

multiples of a hundred are also formed with a suffix, so it's only natural to do the same for multiples of nif.

  • 100: nif

  • 101: nif unu

  • 110: nif ses

  • 111: nif ses unu

  • 200: dunif

  • 300: trinif

  • 400: kvarnif

  • 500: kvinnif

  • 1000: sesnif

  • 1100: ses unu nif

the -illion series is an -iliono series in Esperanto, and the illions are treated as separate words.

  • 1 0000: unu uneksiano

  • 2 0000: du uneksiano

  • 1 0000 0000: unu bieksiano