Japanese has different words for numbers based on what is counted. For each number 1-9 there's a Chinese-derived word and a native Japanese word. Numbers >10 al

Japanese has different words for numbers based on what is counted. For each number 1-9 there's a Chinese-derived word and a native Japanese word. Numbers >10 always use Chinese pronounciations, except for numbers like 20 or 30 which might have a special word for them (if you're counting days or life years). Also number 4 is unlucky and has to be skipped when counting rooms or floors.