I studied Japanese for a couple of years
(demo ima watashi wa sukoshi Nihongo o wakarimasu!) and the guy saying 18, 19... ten-ten instead of 20 is perfectly logical.
1 Ichi
2 Ni
3 San
4 Shi (or Yon)
5 Go
6 Rokku
7 Shichi
8 Hachi
9 Kyu
10 Juu
20 Nijuu ("two-ten")
30 Sanjuu ("three-ten")
But admittedly ten-ten-ten for 30 was pushing it a bit, and ten-ten-ten-ten-ten-ten-ten-ten-ten-ten for 100 was ridiculous!
We had a lot of fun in our small class, reading Japanese to each other and making a complete mess of it
At least the
sensei didn't whack us with a big stick if we got it wrong!
Gryshnak