He was abducted by Hagrid when he turned 11 so that would place him maybe around the fifth or sixth grade.
I don’t know if canonically there are math classes at Hogwarts.
The thought came to while I was watching the anime Mashle. If you are into Harry Potter and One-Punch Man I’d recommend giving it a watch.
Someone mentioned this community below; I wanted to highlight it.
Small promotion for !harrypotter@literature.cafe
Okay dude… Because of YOU I started watching Mashle and I’m not even big into anime. I’ve watched a few and like some occasionally…
Mashle is awesome. Damn/thank you.
That makes me glad I included that with the post