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Japanese Numeral Units Differ from Western Numeric Groupings

[1] 西洋では、一組の数字のセット名は3桁ごとに変わります。千の次はミリオンで、ビリオン、トリリオンと続きます。

Seiyou dewa, hitokumino suujino settowa sanketa gotoni kawarimasu. senno tsugiwa million de billion, trillion to tsudukimasu. 

The names of large numeric sets in the west change every three digits (in multiples of a thousand). The numeric sets after a thousand are a million, follows by a billion, and a trillion.

[2] しかし、日本の数字のセットの名称は4桁ごとに変わります。つまり、万(10,000)、億(100,000,000)、兆(1,000,000,000,000)です。

Shikashi, nihonno suujino setto no meisyouha yonketagotoni kawarimasu. tsumari, man, oku, chou desu.

However in Japan, the names of numeric sets change every four digits, i.e. they are ‘man’ (10,000) ‘oku’(100.000.000) ‘chou’(1,000,000,000,000).

[3]  したがって、10,000円は、10千円ではなく、一万円といいます。しかし、桁を区切るカンマは、西洋と同じように3桁ごとにつけられます。

Shitagatte, 10,oooyen wa,  juu sennenn dewanaku, ichimannenn toiimasu. Shikashi, ketawo kugiru kanmmawa, seiyouto onajiyouni sanketagotoni tsukeraremasu.

Therefore, 10,000 yen is read as ‘ichi man yen’, though commas are placed after the last three digit as in the west.

[4]  カンマを4桁ごとにつけると理解しやすいでしょう

Nihondeha, ojigiha Communication wo enkatsunisuru syudanto shite, totemo taisetsudesu.

It would be easier to understand, if you placed a comma after every four digits.

2017.07.26

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