Is it weird to ask for my teacher's number?

Waut, he expects you to seek out certain things and report back? Sounds like work. What are you getting out of it?
You are an adult, you could ask him out. I expect he will want to wait a bit so it doesn't look like the relationship began while you were still his student.
Sounds like the start of a porno flick
https://www.youtube.com/embed/CoOXbP7hmc0Look kid. Your teacher sounds like a prev. Why do you need to "visit him often" to "report back on things".
Go find what he wants & email him. After today he's not your teacher & most certainly not your friend.
A bit but who cares? You're graduating and an adult
Opinion
5Opinion
If you really want to do this, it won’t be weird as long as you give a disclaimer—a very reasonable and legitimate reason for why you’re asking for the number. Explain the reason, keep it professional, and it won’t be weird. It’s one of those things that will only be awkward if you make it awkward.
A highschool teacher? Cause your 18 so it's sure as hell ain't college. Even though your 18 that will make him look like a creep
cringe
Why would u do that
Go for it
Superb Opinion