Harry Potter Math
Number of Hogwarts Houses MINUS Number of Deathly Hallows
1 (4-3)
Professor Snape
Potions
Hedwig
Owl
Daniel Radcliffe
Harry Potter
Harry's godfather
Sirius Black
Number of Triwizard Champions PLUS Number of children Hermione and Ron have
6 (4+2)
Professor Sprout
Herbology
Crookshanks
Cat
Emma Watson
Hermione Granger
Voldemort's full name
Tom Marvolo Riddle
Number of horcruxes TIMES number of Weasley siblings
49 (7x7)
Firenze
Divination
Fang
Dog
Tom Felton
Draco Malfoy
Professor McGonagall's animagus
Tabby cat
Number of total balls in a Quidditch match PLUS Number of players on a Quidditch team PLUS Number of points you get for scoring the Quaffle
21 (4+7+10)
Professor Sinistra
Astronomy
Trevor
Toad
Alan Rickman
Severus Snape
Where Harry was born
Godric's Hollow
OWLs Hermione earned MINUS OWLs Harry earned
4 (11-7)
Professor Binns
History of Magic
Norbert
Norwegian Ridgeback Dragon
Robbie Coltrane
Hagrid
Ron Weasley's middle name
Bilius