The first step will be to become familiar with the count to ten.
1 一
2 二
3 三
4 四
5 五
6 六
7 七
8 八
9 九
10 十
Then you gonna need these three kanji
百 = 100
千 = 1000
万 = 10000
A useful table since sometimes you gonna meet an old style numericals.
Now we can combine them and get 600
800 八百
3000 三千
8000 八千
Now let's make things a little more complicated
43 076 = 四万三千七十六 , where
四万 = 40 000
三千 = 3000
七十 = 70
六 = 6
On a real document, the serial number will be located vertically
四
万
三
千
七
十
六
1 一
2 二
3 三
4 四
5 五
6 六
7 七
8 八
9 九
10 十
Then you gonna need these three kanji
百 = 100
千 = 1000
万 = 10000
A useful table since sometimes you gonna meet an old style numericals.
Now we can combine them and get 600
800 八百
3000 三千
8000 八千
Now let's make things a little more complicated
43 076 = 四万三千七十六 , where
四万 = 40 000
三千 = 3000
七十 = 70
六 = 6
On a real document, the serial number will be located vertically
四
万
三
千
七
十
六