15 Halloween trivia questions you can work out at the party
I'm Heron. I wear a flamingo costume every Halloween, and I once bought it half off, handed over a 20% coupon, and told the cashier my savings were 70%.
So these fifteen questions are the ones a party can actually answer. Every one of them is solvable from the numbers printed inside it.
Why the $40 costume rings up at $16
Two discounts stack, and stacking is smaller than adding. The sign halves $40 and leaves $20, then the coupon takes a fifth of that $20, which is $4.
We're calling that move The Second Cut. Every discount after the first one measures itself against what is still on the tag, and the tag keeps shrinking.
The pair comes to 60% off the ticket, and swapping the order of the two cuts changes nothing. Let's run the same move on a meaner sign, one step at a time.
Step 1 of 5on the ticket
$60
Halloween trivia questions for the party
Seven questions, and every number you need is printed in them. The costume was number 1, so the cards start at 2, and the scoreboard at the end will ask how many you took clean.
Hosting a party?
Riddle 2 of 15
You buy 4 bags of 45 candies and hand out 3 to every kid. How many kids before the bowl is empty?
Hint: Count the candies first, and count them in two friendly pieces.
60 kids
14 × 40 = 160the round piece first
2160 + 20 = 180and four fives on top
3180 ÷ 3 = 60 kidsthree candies a doorstep
Splitting 45 into 40 and 5 turns a multiplication you would rather not do into two you already own.
Riddle 3 of 15
Trick-or-treating runs 6:00 to 7:30, and each house takes 3 minutes. How many houses do you get to?
Hint: Put the window into minutes before you divide anything.
30 houses
16:00 → 7:30 = 90 minan hour and a half
290 ÷ 3 = 30 housesthree minutes a door
Clock faces hide the arithmetic, and one line of minutes hands it straight back to you.
Riddle 4 of 15
Your sister comes home with three times your haul. Together you have 84 candies. How many are yours?
Hint: How many equal shares are lying on the floor in total?
21 candies
✕84 ÷ 3 = 28dividing by the wrong number
11 + 3 = 4 sharesyours, plus her three
284 ÷ 4 = 21and hers is 63
Three times as many makes four shares on the floor, and the floor is what gets divided.
Riddle 5 of 15
A 20-pack of candy costs $6 and a 50-pack costs $12.50. Which one is cheaper per candy?
Hint: Divide each price by what is actually in the bag.
The 50-pack
1$6 ÷ 20 = 30¢the small bag, per candy
2$12.50 ÷ 50 = 25¢the big bag, per candy
3the 50-pack, at 25¢a nickel a candy cheaper
Sticker prices rank the bags by size, and one division ranks them by what a candy costs.
Riddle 6 of 15
Halloween falls on a Saturday, and the February that follows has 28 days. What day is it a year later?
Hint: How many whole weeks fit inside a year, and what is left over?
Sunday
1365 ÷ 7 = 52 weeks + 1one day left over
2Saturday + 1 = Sundaya leap year would add two
A year is a whole number of weeks plus a day, so every date walks one weekday forward at a time.
Riddle 7 of 15
The horror marathon starts at 8:15 pm and runs three 95-minute movies back to back. When does it end?
Hint: Ninety-five is five short of a hundred, three times over.
1:00 am
13 × 95 = 285 min300 minus three fives
2285 min = 4 h 45four hours and three quarters
38:15 + 4:45 = 1:00one in the morning
Rounding 95 up to 100 and paying the 15 back afterwards keeps the whole sum in your head.
Riddle 8 of 15
You need 240 candies for the porch and each bag holds 18. How many bags do you buy?
Hint: What happens to the candies that do not fill a whole bag?
14 bags
✕18 × 13 = 234six candies short
1240 ÷ 18 = 13.3the leftovers still need a bag
2= 14 bagsa spare bag beats a dark porch
Division answers how many full bags there are, and the remainder is the part that sends you back to the store.
Question 5 is the one that follows you out of October. Price per unit is the only honest way to rank two bags, and the aisle is built to make you rank them by the number on the front.
One more sign before the wording turns mean, and this time you do it.
$50 − 20% − 25% =
Same rules as above. You've got this.
The next seven barely need a calculator. Six of them hide the whole difficulty in one word, and the last one hands the costume trick back to you wearing a different mask.
Read these out loud. A sentence does its best work on a room that is only half listening.
Halloween trivia questions that hide the trick in the wording
Every one of these is a reading test wearing a costume. The numbers are small enough to do standing up, and the wrong answer is usually the question you thought you heard.
The fix is to name the thing being asked for, out loud, before answering. A pound, a fraction of a room, a place in a line: each one is a different noun, and the noun is where the money is.
Question 9 collapses that way in about two seconds, and so does the bag that weighs 25% more. Let's slow the reading down and let the arithmetic take care of itself.
Riddle 9 of 15
You are third from the front of the candy line and third from the back. How many kids are in the line?
Hint: Draw the line and put yourself in it exactly once.
5 kids
✕3 + 3 = 6counts you twice
12 ahead + you + 2 behindeveryone counted once
2= 5 kidsthe line is shorter than it sounds
Both counts include you, so adding them hands the line a child who is not standing in it.
Riddle 10 of 15
Which weighs more: a pound of candy corn or a pound of plastic spider rings?
Hint: Read the two amounts before you picture the two piles.
The same
11 lb = 1 lbthe pound is the whole answer
The question dangles two very different piles and hopes you weigh the nouns instead of the pounds.
Riddle 11 of 15
A mummy is 3,000 years old. A vampire is twice as old as the mummy was 1,000 years ago. How old is the vampire?
Hint: Which year is the doubling attached to?
4,000 years
✕3,000 × 2 = 6,000doubling the wrong age
13,000 − 1,000 = 2,000the mummy back then
22,000 × 2 = 4,000the vampire today
One small word turns is into was, and the doubling quietly lands on an age nobody asked about.
Riddle 12 of 15
Half your guests come as ghosts. Half of the rest come as vampires. What fraction comes as neither?
Hint: The second half is a half of a half.
A quarter
1½ ghostshalf the room, in sheets
2½ of ½ = ¼ vampireshalf of what is left
31 − ½ − ¼ = ¼a quarter wore something else
Two halves sound like the whole room, and the second one is measured against a room that already shrank.
Riddle 13 of 15
The party starts at 9:00 pm on the night the clocks go back an hour. How long until 3:00 am?
Hint: The clock and the night disagree tonight.
7 hours
✕9 pm → 3 am = 6 hourswhat the clock shows
1the clocks go back onceone hour gets lived twice
26 + 1 = 7 hoursseven hours of party
Clock arithmetic assumes the clock ran straight through, and tonight it takes a step backwards.
Riddle 14 of 15
Your candy bag weighs 4 pounds and your sister's is 25% heavier. How much lighter is yours than hers?
Hint: A percentage always points back at one specific number.
20%
✕25% lighter either waya mirror that is not there
14 × 1.25 = 5 lbher bag, one pound heavier
21 ÷ 5 = 20%that pound, measured off hers
The same pound is a quarter of your bag and a fifth of hers, because the two bags are different numbers.
Riddle 15 of 15
Parents take a 10% candy tax, then you trade away 10% of what is left. How much of the haul survives?
Hint: The second tenth is measured on a smaller pile.
81%
✕10% + 10% = 20% goneadding the two bites
1100% − 10% = 90%what the tax leaves
290% − 9% = 81%the trade takes a tenth of that
The Second Cut works on the way out of the bag as well, because the second tenth is a tenth of less.
All fifteen pay the same wage: the answer that turns up before the arithmetic does. The 70% that flashed into view at the costume rack is the cleanest example of it on this page.
Psychologist Shane Frederick built a famous three-question test around answers that arrive that fast, and at Harvard, MIT, and Princeton most students grabbed the fast, wrong answer. Our Halloween riddles call the reflex The Candy Trap, and it turns out to work in a costume aisle as happily as it does in a candy bowl.
What to remember
Percentages never add up. The Second Cut works on sale racks, tips, and salary offers, and Halloween is simply where it shows up in a costume.
Ask what the number is measured against. A quarter heavier one way is a fifth lighter the other, and both sentences describe the same pound.
Count yourself exactly once. Lines, shares, and rooms all hide the same double count, and drawing it once kills it.
Honest tally: how many did you solve without peeking?
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FAQ
The ones nobody can lose by not knowing. Every question on this page is solvable from the numbers printed in it: a costume with two discounts stacked on it, a candy bowl that has to reach sixty kids, a haul split three to one, and a party that runs through the night the clocks go back.
Because the second discount comes off what is left. Half of $40 is $20, and a fifth off that $20 is $4, so you pay $16 and save $24. That is 60% of the ticket price, and the order of the two cuts changes nothing.
Start with questions 2, 3, and 5: the candy bowl, the trick-or-treat window, and the two bags of candy at different prices. Each one is a line or two of arithmetic, and every answer comes with the shortcut that got there.
Use the copy button above the first card to drop all 15 into a chat, read them out one at a time, and let everyone commit to an answer before you reveal anything. Keep a tally per person, and hold the answers until the last guest has voted.
Fifteen is about twenty minutes of play with a room that argues, which is most rooms. If the party is bigger, run the seven number questions as round one and the seven wording questions as a tiebreaker.
