How many letters are left in the alphabet after subtracting R-on-W-o-r-m-t-a-i-l? Answer: 18

How many points did Gryffindor have to subtract during their Quidditch match when their keeper caught the snitch? Answer: 150

If Hagrid had 3 Kneazles and he gave one to Mrs. Norris, how many Kneazles does he have left? Answer: 2

If a Chinese Fireball dragon has 314 scales and it sheds 21, how many scales does it have left? Answer: 293

How many Galleons did Wizard Tycho subtract from his vault when purchasing the 500-year-old potion? Answer: 9,1000

How many Chudley Cannons games would Ron have to subtract from his total if he was no longer able to attend? Answer: 10

How many Slytherins were left in the Great Hall after the team of Quidditch players left? Answer: 777

If Hermione had 154 books in her bag and then confiscated 14 books from students, how many books does she have left? Answer: 140

How many floors of the castle are left after subtracting the seven floors of the dungeons? Answer: 35

If a Nimbus 2000 broomstick has 150 spells on it and Hermione used 44, how many spells are left? Answer: 106