#arithmancy

[akiyamacho]

"Trying to make Eloise Babbit smile" Project by giving her Diana's own spell book finally finished 🥰 both girls are in love with arithmancy 🥰

A gift for @myokk @myokk-a

[th3halfbloodprince]

Why would anyone take divination or muggle studies, when arithmancy is right there.

[velvet4510]

Which Hogwarts electives did Snape take?

Ancient Runes and Arithmancy

Ancient Runes and Care of Magical Creatures

Ancient Runes and Divination

Arithmancy and Care of Magical Creatures

Arithmancy and Divination

Care of Magical Creatures and Divination

Voting ended onAug 17, 2025

I think we can rule out Muggle Studies since he grew up in the Muggle world and became a Death Eater.

[celistialsea]

Rating:

Teen And Up Audiences

Archive Warning:

No Archive Warnings Apply

Category:

Gen

Fandom:

Harry Potter - J. K. Rowling

Relationship:

Hermione Granger/Draco Malfoy

Characters:

Hermione GrangerHarry PotterRon WeasleyDraco MalfoySeverus Snape

Additional Tags:

Magical Realism Magical Theory (Harry Potter)Book 1: Harry Potter and the Philosopher's Stone Series Rewrite Inspired by Harry Potter and the Methods of Rationality | HPMOR Inspired by The Arithmancer

Language:

English

Series:

Part 1 of The Serpent and the Architect

Stats:

Hermione Granger, a brilliant Muggle-born witch who approaches magic with an intensely logical, scientific mind, viewing it as a quantifiable system of Arithmancy and Ancient Runes. Her summer is dedicated to deciphering the Grand Equation of magic, preparing her for Hogwarts. However, her meticulous calculations are shattered when the Sorting Hat, recognizing her ambition and drive for mastery, places her in Slytherin.

Updates Tuesdays and Fridays aside from first three chapters.

Fic is fully completed.

Chapter One:

https://archiveofourown.org/works/66684868/chapters/172045906

[kahran042]

Some interesting things about the Hogwarts houses

All four have trisyllabic names.

The two houses associated with the "dry" elements - Gryffindor and Hufflepuff - both have ten-letter names, female Heads of House, and founders with bisyllabic first names, and the two houses associated with the "moist" elements - Ravenclaw and Slytherin - both have nine-letter names, male Heads of House, and founders with trisyllabic first names.

The houses associated with "warm/active/masculine" elements - Gryffindor and Ravenclaw - have their dorms in the towers, and the houses associated with the "cold/passive/feminine" elements - Hufflepuff and Slytherin - have their dorms in the basement.

Ravenclaw is the only house with an avian mascot, and Slytherin is the only one with a reptilian mascot.

This is pure headcanon, but I think that at least part of why Slytherin House has never been dissolved* is that the enchantments on Hogwarts include arithmantic calculations that are dependent on the existence of four houses, no more or less, and dissolving one or adding a new one could prove disastrous.

* - Besides all the other reasons, of course.

[simply-slytherin]

A dark secret hidden in the closet of the Arithmancy classroom

screenshots by: @simply-slytherin

Okay so I've been spending way too much time gathering screenshots and exploring the tiniest of details around Hogwarts. I'm fully back into this hyperfixation. But as I've been exploring I'm discovering secrets and stories hidden in the environment. This one is especially interesting (if not the most unknown/not talked about). I believe that there is a chance that whoever the current Arithmancy teacher is in Hogwarts Legacy is a Werewolf. This is the only location in this closet with scratch marks, and at the time of posting this I haven't found these marks on any other walls...which tells me this is intentional. I love finding stuff like this since it adds to my head cannons of life in the era of Hogwarts Legacy.

[thesleepingdemonofhogwarts]

Arithmancy

Hermione’s favourite subject, this is the process of predicting the future through numbers. It’s also called numerology. It comes from two Greek words: ‘arithmo’ meaning number and ‘mancy’ meaning prophecy.

[asktheheirofslytherin]

If you think about it, Harry probably can't do math or any other muggle subject past 4th grade, because the Dursleys only had him during summer and wouldn't DARE to spend any more money on him with tutors and stuff. And I'll assume that Hogwarts barely taught any math because ✨ Magic School✨ mainly for magic.

Of course we know math.

I believe Harry Potter completed the fifth grade of primary school with the muggles, but regardless, math and science is sprinkled throughout many Hogwarts classes. You truly think potions would not cover measurements and ratios? That charms would not teach students to account for factors such as wind velocity? That herbology would not cover the biological concepts of photosynthesis?

And for those with an aptitude at mathematics, there are classes such as advanced potions, arithmancy, and magical theory (which draws many parallels to physics).

I assure you Hogwarts has a very competitive curriculum.