2530: Welsh Numbers Nov 16, 2021

People may be aware that French numbers use somewhat mathematical descriptions, like soixante-dix for 70 meaning sixty-ten, and 'quatre-vingts' for 80 meaning 'four-twenties' but Welsh numbers are even more extreme. Indeed, there are actually two different systems, one decimal and one vigesimal. The decimal system operates similarly to English's decimal system, but the vigesimal is base-20 for all numbers so to say '30' it is 'deg ar hugain' (ten on twenty), '40' is 'deugain' (two twenty) and likewise for 60 and 80. To say ‘70’ is 'deg a thrigain' (ten and three twenty) and likewise for 90, but 50 is 'hanner cant’ (half a hundred) which also does not exist in the decimal system. The vigesimal system is more common when talking about dates and ages etc. and people may switch back-and-forth. There are many internal variations as well, including dropping the prepositions, or adjectival forms.