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I don't understand how the author is judging complexity. The top one, Huli, is a base-15 number system but looks quite regular otherwise. French, on the other hand, switches from a base-10 to a base-20 at 80 and then switches things up at 97. According to the listing, Welsh sits somewhere between these two but it has separate numbering systems for {20s, 40s, 60s, 80s}, {30s, 70s, 90s}, and {50s}. That seems much more complicated than either Huli or French. |
Japanese numerals are quite easy, but when it comes to actually counting things, it is quite complex. There are two series of numeral words that are used in different contexts, as well as dozens of counter words that pair with a variety of semantic categories. Many combinations or number + noun have quite irregular combinations, like "hatachi" (20 years of age) or "hatsuka" (20th day of the month).