1 = Ichi
2 = Ni
3 = San
4 = Shi
5 = Go
6 = Roku
7 = Shichi
8 = Hachi
9 = Kyu
10 = Jiu
Want to continue counting? In Japanese they always mention the tens first. Like Ten-One = 11. Then, Two-Ten = 20, etcetera.
11 = Jyu-Ichi
12 = Jyu-Ni
13 = Jyu-San
14 = Jyu-Shi
15 = Jyu-Go
16 = Jyu-Roku
17 = Jyu-Shichi
18 = Jyu-Hachi
19 = Jyu-Kyu
20 = Ni-Jyu
100 = Hyaku
1.000 = Sen
10.000 = Man
1.000.000 = Hyaku-Man
100.000.000 = Ichi-Oku
1.000.000.000 = Jyu-Oku
1.000.000.000.000 = Chou
They have a different kind of character:
Karate is a Japanese art, so many Japanese words are used. Counting is of course done using Nihongo (Japanese language).
In the Dojo during warm-up or rhythm-type exercises you usually don't count further than 1-8. This has to do with rhythm as well as equal practise of the left and right side.
In our Dojo, we use a system that we learned from Nukina sensei.
The sensei counts Ichi, Ni, San, Shi and the students continue: Go, Roku, Shichi, Hachi.
I personally favor this method because of mental preparation and team spirit.
"Traditionally" -according to Sakagami sensei- Taiso counting was done like this:
Ichi, Ni, San, Shi, Go, Roku, Shichi, Hachi. (first sequence)
Ni, Ni, San, Shi, Go, Roku, Shichi, Hachi. (second sequence)
San, Ni, San, Shi, Go, Roku, Shichi, Hachi. (third sequence)
When doing kicks and punches, it is normal to count to ten! Or, when sensei counts, it might be like:
So don't get too hung up on formal counting..
Counting is done for rhythm-like and structural purpose. And the way you count, should suit the exercise.
If you are interested to find out more, I recommend you to visit this page.