The Sum of Opposites

Which of the following pairs of numbers are opposites?

Groups:

(a) Opposites

,

(b) Not Opposites

• 10 and -10

• 7 and 0

• 4 and 4

• -2 and 2

In the magical world of Hogwarts, what spell is cast when you combine two opposing charms?

• The charms transform into a positive spell

• The charms transform into a negative spell

• The result is a neutral spell, equivalent to zero

• The result is a unity spell, equivalent to one

If you, like Harry Potter, start at number 5 on the Quidditch scoreboard and a Dementor deducts 5 points, what will be the new score?

• -5

• 0

• 5

• 10

If you're in the Hogwarts library at 8 o'clock and a time-turner is used to go back 8 hours, what time would it be?

• -16

• 0

• 8

• 16

If you're in the dungeons of Hogwarts at position -3 and move 3 steps towards the Great Hall, where will you end up?

• -6

• 0

• 3

• 6

If you're in the Hogwarts library at 6 o'clock and you use a time-turner to go back 3 hours, but then a spell brings you forward 3 hours, what time would it be?

• 0

• 3

• 6

• 9

If you, like Harry Potter, start at the number 10 and cast a spell that subtracts 10, what magical number will you end up with?

• -10

• 0

• 10

• 20

If the sea level in the Black Lake at Hogwarts drops by 1 meter, how much will it need to rise to return to its original level?

• 1 meter

• 2 meters

• 3 meters

• 4 meters

If Harry Potter had 0 galleons in his Gringotts account and earned 200 galleons, how many galleons did he spend on Every Flavour Beans, if he AGAIN has 0 galleons in his Gringotts account?

• -200 galleons

• 0 galleons

• 20 galleons

• 400 galleons

If the temperature in the Hogwarts Great Hall is 5 degrees and it drops by 3 degrees due to a spell, how much will it need to increase to be back up to 5 degrees?

• 2 degrees

• 3 degrees

• 4 degrees

• 5 degrees