Game Location: ハコダテ
The main point:
Counting from 1-10 in Japanese is relatively simple. The only thing to watch out for are 4 and 7, which have two pronunciations.
The longer explanation:
Here is how you count from 1-10.
|Four||四||し or よん|
|Seven||七||しち or なな|
What's the difference between the two readings for 4 and 7?
Mostly, it just depends on preference. If you are just counting numbers normally, either one is okay. If a group of native Japanese people are counting together, half will say it one way and half will say it the other.
I have read online that some people avoid saying し due to it being pronounced the same as the word for death in Japanese. I have personally never met a Japanese person that agrees with that. However, し is considered to be an unlucky number because of that, so I don't think it's completely unfounded.
Numbers are not changed by formality in Japanese.
When using numbers to count animals, objects, etc. you will need to use counters. This will be taught later.