structural:scholar_edition
Numerals

The numeral system used in the majority of Francophone countries employs both decimal and vigesimal counting. After the use of unique names for the numbers 1–16, those from 17 to 69 are counted by tens, while twenty (vingt) is used as a base number in the names of numbers from 70 to 99. The French word for 80 is quatre-vingts, literally "four twenties", and the word for 75 is soixante-quinze, literally "sixty-fifteen". The vigesimal method of counting is analogous to the archaic English use of score, as in "fourscore and seven" (87), or "threescore and ten" (70).

Belgian, Swiss, and Aostan French as well as that used in the Democratic Republic of the Congo, Rwanda and Burundi, use different names for 70 and 90, namely septante and nonante. In Switzerland, depending on the local dialect, 80 can be quatre-vingts (Geneva, Neuchâtel, Jura) or huitante (Vaud, Valais, Fribourg). The Aosta Valley similarly uses huitante for 80. Conversely, Belgium and in its former African colonies use quatre-vingts for 80.

In Old French (during the Middle Ages), all numbers from 30 to 99 could be said in either base 10 or base 20, e.g. vint et doze (twenty and twelve) for 32, dous vinz et diz (two twenties and ten) for 50, uitante for 80, or nonante for 90.

The term octante was historically used in Switzerland for 80, but is now considered archaic.

French, like most European languages, uses a space to separate thousands. The comma (French: virgule) is used in French numbers as a decimal point, i.e. "2,5" instead of "2.5". In the case of currencies, the currency markers are substituted for decimal point, i.e. "5$7" for "5 dollars and 7 cents ".