Nihongo lesson (numbers part2)

1000 = 千sen. = 一千 = issen
2000 = 二千 = nissen
3000 = 三千 = sanzen
4000 = 四千 = yonsen
5000 = 五千 = gosen
6000 = 六千 = rokusen
7000 = 七千 = nanasen
8000 = 八千 = hassen
9000 = 九千 = kyuusen
10.000 = 一万 = ichiman
20.000 = 二万 = niman