"a position as ABC" vs "one of the ABC positions"

[Kwfine]

Dear teachers,

I am writing an email to my good friend (Jan) in Australia about my recent job application. The employer offered several vacancies for the position which title is "mathematics teacher".

I am not sure which of the following sentences is the best for me to write in my email?

1. Recently, I applied for a position as a mathematics teacher in a school.
2. Recently, I applied for one of the mathematics teacher positions in a school
3. Recently, I applied for the positions of mathematics teacher in a school.

Or could you suggest a sentence for me please, teachers?

Thank you.

Kitty

[Mister Micawber]

1. Recently, I applied for a position as a mathematics teacher in a school.
_________________
Native English teacher at Mister Micawber's

[Kwfine]

[Mister Micawber]

Use 2 when it is critical to mention that there is more than one; otherwise, it just confuses. Don't use 3 at all.
_________________
Native English teacher at Mister Micawber's

[Kwfine]