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.
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Is this another weird thing Rowling tweeted out later like how they magic away their poop?
No it’s in the book, 3rd year divination she complains about it
Arithmancy was in the books as an electives starting year 3. Harry didn’t take it.
I figured it might’ve actually been addressed properly, but I couldn’t resist bringing up how she tweeted about wizards and witches magic-ing away their poop.
Writing that also made me realize that there are only two genders for magic users in her world which is not surprising of course lol
Arithmancy at Hogwarts is also very different to traditional arithmetics. It is the use of numbers to predict the future, kinda like divination.
Yeah, reading the wiki, it seems like it was a lot of memorizing number charts.