Numbers:

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The Japanese numbering system is the easiest part of the language to get. Basically, if you can count to 10 you can count to a million. The numbers snap together like legos to make new numbers.

Let's take a look at the basic 10.

1 Ichi

Notice 2 of the numbers have alternate readings (4 and 7). The alternate readings are generally used for Dates and Time. But not necessarilly 100% of the time. When counting floors in a building, Yon is generally used because SHI is a Homonym for "Death" and that would be unlucky in an elevator. The month of April, however is "Shi-Gatsu". Listening to a native is really the only way to figure out when to use which reading when.

2 Ni
3 San
4 Shi (yon)
5 Go
6 Roku
7 Shichi (nana)
8 Hachi
9 Ku
10 Juu

See how they snap together? It's sorta like decimals with the 1's tens and hundreds columns.

23 = Ni-Juu-san

54 = Go-Juu-yon

100 = Hyaku

154 = Hyaku-go-juu-yon

1000 = sen

1154 = Sen-Hyaku-go-juu-yon

11 Juu ichi
12 Juu ni
13 Juu san
14 Juu yon
15 Jjuu go
16 Juu roku
17 Jjuu nana
18 Juu hachi
19 Juu ku
20 Ni juu

 

 
Using Numbers in Months and Days