Is 2100 nisen hyaku or nisen yihyaku ? Similarly for 2210, nisen nihyaku juu or nisen nihyaku yijuu ?
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2What is yi in yihyaku and yijuu? – Earthliŋ♦ Apr 22 '18 at 12:15
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1@Earthliŋ Yī appears to be the Chinese reading of 一 ... – Aeon Akechi Apr 22 '18 at 17:34
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1Highly related: In conversation can you just say “万円です” or must you say “一万円です”? いっぴゃく is used only in certain rare situations (see my answer) – naruto Apr 23 '18 at 7:08
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Where are you getting this "yi" sound from? To answer your question, larger numbers that start with 1 do not require that the "one" be spoken. Similar to "a hundred" and "a thousand" in English, it can be and usually is omitted. So 1100 would "sen hyaku" (though you could say issen hyaku... but I would not say issen ippyaku, that just sounds weird...) And there would never be a "one" in front of "ten" either, so your example 2210 would be "ni sen ni hyaku juu"
