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Lesson 5: Numbers
In this lesson, we will study Japanese numbers. Let's start with one through ten.  
1  10 れい or ゼロ 
zero 
Note that several of the numbers have two pronunciations. Each pronunciation is used in specific situations. Sometimes either pronunciation is acceptable. 

11  19 The numbers from 11 to 19 are formed by putting the appropriate number after ten. Thus 11 is じゅう + いち = じゅういち. 

じゅういち じゅうに じゅうさん じゅうし or じゅうよん じゅうご じゅうろく じゅうなな or じゅうしち じゅうはち じゅうきゅう or じゅうく 
11 
20
 90
The numbers from 20 to 90 are formed by putting the appropriate number before ten. Thus 20 is に + じゅう = にじゅう. Think of it like saying 'two tens.' 

にじゅう 
twenty thirty fourty (Not しじゅう) fifty sixty seventy eighty ninety (Not くじゅう) 


Examples: さんじゅうに 

100
 900
One hundred is ひゃく. The numbers from 200 to 900 are formed like the numbers from 2090. Be careful as there are some exceptions in pronunciation. 

にひゃく さんびゃく よんひゃく ごひゃく ろっぴゃく ななひゃく はっぴゃく きゅうひゃく 
200 
Note the exceptions in pronunciation for the numbers with asterisks.  
せん 
thousand ten thousand hundred thousand million ten million hundred million 