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
In the games, arithmancy is portrayed as number puzzles that need to be solved.
In JK Rowling’s mind the number puzzles are things like “How many genders are there?”
The correct answer, of course, is “Fuck you, JK Rowling, that’s how many.”
So crazy that a woman who liberally employed the Polyjuice Potion in her novels and had ghosts who would just wander through the restrooms to talk to you would take some of the most insanely conservative positions on changing your appearance or who should be allowed in the toilet.
“Billionaire has shitty beliefs. In other news, the weather in London is still complete ass.”
She has been outspoken on the fact that her positions are basically due to personal trauma and nothing else
Why would you encourage more people to be sexually assaulted as a response to your own history?
Remember when Hagrid assigned his dragon the wrong gender at hatching?