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Counting in Ido

Language overview

Forty-two in Ido Founded in 1907 and based on Esperanto, Ido is a constructed language aimed at becoming a universal second language for speakers of different linguistic backgrounds, which is quite a good definition for an international auxiliary language.

Ido numbers list

  • 1 – un
  • 2 – du
  • 3 – tri
  • 4 – quar
  • 5 – kin
  • 6 – sis
  • 7 – sep
  • 8 – ok
  • 9 – non
  • 10 – dek
  • 11 – dek-e-un
  • 12 – dek-e-du
  • 13 – dek-e-tri
  • 14 – dek-e-quar
  • 15 – dek-e-kin
  • 16 – dek-e-sis
  • 17 – dek-e-sep
  • 18 – dek-e-ok
  • 19 – dek-e-non
  • 20 – duadek
  • 30 – triadek
  • 40 – quaradek
  • 50 – kinadek
  • 60 – sisadek
  • 70 – sepadek
  • 80 – okadek
  • 90 – nonadek
  • 100 – cent
  • 1,000 – mil
  • one million – un milion
  • one billion – un miliardo
  • one trillion – un biliono

Ido numbering rules

Now that you’ve had a gist of the most useful numbers, let’s move to the writing rules for the tens, the compound numbers, and why not the hundreds, the thousands and beyond (if possible).

  • Digits from one to nine are specific words: un [1], du [2], tri [3], quar [4], kin [5], sis [6], sep [7], ok [8], and non [9].
  • Tens are formed by prefixing the word for ten (dek) by its multiplier digit, followed by the letter a, except for ten itself: dek [10], duadek [20], triadek [30], quaradek [40], kinadek [50], sisadek [60], sepadek [70], okadek [80], and nonadek [90].
  • Compound numbers are formed by linking the ten with its unit digit with the word e (and) separated with dashes (e.g.: dek-e-un [11], quaradek-e-kin [45]).
  • Hundreds are formed by prefixing the word for hundred (cent) by its multiplier digit, followed by the lettre a, except for one hundred itself: cent [100], duacent [200], triacent [300], quaracent [400], kinacent [500], sisacent [600], sepacent [700], okacent [800], and nonacent [900].
  • Thousands are formed like hundreds, i.e. by prefixing the word for thousand (mil) by its multiplier digit, followed by the lettre a, except for one thousand itself: mil [1,000], duamil [2,000], triamil [3,000], quaramil [4,000], kinamil [5,000], sisamil [6,000], sepamil [7,000], okamil [800], and nonamil [9,000]. Higher multiples of one thousand are formed the same way (e.g.: dekamil [10,000], centamil [100,000]).
  • Higher scale numbers follow the long scale numbers rule in which every new term greater than million is one million times the previous term: un milion [1 million] (106), un miliardo [1 billion] (109), un biliono [1 trillion] (1012).

Write a number in full in Ido

Let’s move now to the practice of the numbering rules in Ido. Will you guess how to write a number in full? Enter a number and try to write it down in your head, or maybe on a piece of paper, before displaying the result.

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Auxiliary languages

Afrihili, Babm, Bolak, Digisk Folkspraak, Esperanto, Folkspraak, Globasa, Glosa, Guosa, Idiom neutral, Ido, Intal, Interlingua, Interlingue, Interslavic, Kotava, Langue nouvelle, Latino sine flexione, Lingua Franca Nova, Lingwa de planeta, Mondial, Mondlango, Pandunia, Ro, Romanid, Slovio, Solresol, Sona, Spokil, Tutonish, Universalglot, Uropi, and Volapük.

Other supported languages

As the other currently supported languages are too numerous to list extensively here, please select a language from the full list of supported languages.

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