Property tax deduction on rental room in my primary for 3 months

[Evguenia W.]

In 2020, I rented out one room in my 2 bedroom, (50% of the house), primary residence for 3 months until the person stop paying.

Question: I was wondering how much of the property taxes can I deduct from my rental income on my income tax filing?

1) Is it 50% of the 2020 year property tax?

2) Is it 50% then divided by 12 months then times by 3 months (that is what the renter paid for in out of 12 months in 2020)?