It's as shrimple as that. Mod note: exactly

Some other techniques that could work

-Wait for the teachers to start chasing either Abbie or Claire and then summon Ghost Rider/Spawn and point whichever one is summoned in the direction of the teachers. After this, kick back with some popcorn and watch the teachers get soloed no diff

or if you want to be a bot more realistic

-Have the entire school be investigated. If the lore in FPE:S matches the lore in FPE exactly, then Miss Grace doesn't fully pay the electric bill. Additionally, consider that Miss Circle herself is putting advanced mathematics on the board. In FPE:S, I presume it is advanced calculus; while the FPE fandom wiki says she has above average intellect and can write algebraic expressions, it also states that she doesn't know how to properly form them. This could mean she doesn't actually know the subject that well and is therefore not qualified to be teaching - henceforth, she could not only see potential fines but would probably be fired. But this gets a lot bigger - if one of the teachers isn't qualified and the lady who's supposed to be in charge of the f**king school isn't paying the bills, then what else could be going wrong there (aside from the blatantly obvious murders, of course)?

Really the only thing standing in the way of the second option is Alice because you can't guarantee that she won't outright kill the inspectors. So I guess you'd probably be better off letting Ghost Rider and/or Spawn loose on the murder-teachers and Alice first then letting the inspectors come in to clean up and deal with whatever the hell Miss Grace is doing.

I believe FPE:S made the electric bill thing up. I'm not sure about what was on the board though, but it's likely the devs of FPE:S also just put thay there. However, considering that there are children present in the actual animation, and how most of the students seem young, this is likely an elementary school. I wouldn't put it past Miss Circle to be teaching advanced math to 10 year olds

Definitely looks like calculus to me but considering that most of the writing is literally layered over itself and that she allegedly doesn't actually understand it, yeah no I don't think Miss Circle is actually qualified.

Coming from a current honors Pre-Calculus student, my teacher makes sure that people can understand what the hell is going on. Believe it or not, but I have never actually somewhat enjoyed a math class like his before. That's just how good of a teacher he is.

That being said, I have a feeling the youngest they could possibly be is middle school, considering the fandom wiki page on Ruby talks about her being much taller than everyone else and "based on the things written on Miss Bloomie's board in her classroom, we can also assume that the students are in high school, making Ruby's height even more astonishing."

Again, coming from a personal standpoint on this, I have known SEVERAL people at my school who are actually just MOUNTAINS of men - two graduated already and one is currently a sophomore.

Before you mention Miss Sasha, either, it could be possible that they have something at that school for the really young kiddos. Once again, at my own, there is something there specifically for the really young children (granted I am pretty sure it is special education, but my point still stands - there's like two or three total faculty members responsible for that part of the school). So it isn't entirely out of the question imo. Moreover, Zip is most definitely A LOT older than her younger brother Chip. So the high school thing would make sense.

To top it off, the characters' appearances alone would definitely check out. Paper School being some kind of private high school would likely put Claire somewhere between 13-15 years old, and she does look to be somewhere within that age range. The youngest one actually at the school, by my opinion, would have to be Riley.

Yeah that does make sense. It's possible it's a school that accommodates all grades, or most of them.
On the topic of math class I am having fun with Physics (yes I know it's science but I'm doing more math in physics than I am in Geometry) for the most part, even with the many setbacks, but I don't think I'm going to go anywhere with this considering I'm not qualified to take physics.