ju-ichi - 11 (eleven)
ju-ni - 12 (twelve)
ju-san - 13 (thirteen)
ju-shi - 14 (fourteen)
ju-go - 15 (fifteen)
ju-roko - 16 (sixteen)
ju-shichi - 17 (seventeen)
ju-hachi - 18 (eighteen)
ju-ku - 19 (nineteen)
ni-ju - 20 (twenty)
Counting in Japanese
ichi - 1 (one)
ni - 2 (two)
san - 3 (three)
shi - 4 (four)
go - 5 (five)
roko - 6 (six)
shichi - 7 (seven)
hachi - 8 (eight)
ku - 9 (nine)
ju - 10 (ten)