Brain Teasers
What has one eye but can’t see?
What is needle
Which number is missing: 5, 10, __, 20, 25
What is 15?
You buy a $70 shirt and pay with a $100 bill. The cashier gives you $30 change. Later they find out the bill was fake. How much did they lose?
What is $100?
What 3 numbers give the same result when added or multiplied?
What is 1, 2, 3 (1 + 2 + 3 = 6, 1 × 2 × 3 = 6)
Name three consecutive days without using Monday, Tuesday, Wednesday, etc.
What is yesterday, today, and tomorrow?
Which word is spelled incorrectly in every dictionary?
What is “incorrectly”?
Which comes next: 1, 3, 6, 10, 15, ___
What is 21?
If it takes 5 machines 5 minutes to make 5 gadgets, how long would 100 machines take to make 100 gadgets?
What is 5 minutes?
If you write all numbers from 1 to 100, how many times do you write the digit “1”?
What is 21?
What two whole numbers when multiplied together give the same result as when added?
What are 2 and 2
What can travel around the world while staying in one spot?
What is a stamp?
Find the missing number: 16, 06, 68, 88, __, 98
What is 87 (upside-down numbers)
There are 3 light switches outside a room. Only one controls the light bulb inside. You can only go in the room once. How do you figure out which switch it is?
Turn one switch on, wait, turn it off. Turn another on. Enter. If bulb is hot, it was first. If on, second. If off and cold, third.
I add five to nine and get two. The answer is correct, but how?
What is it’s a clock — 9:00 + 5 hours = 2:00?
How many times can you subtract 5 from 25?
What is once (then it’s no longer 25)
What has a head, a tail, but no body?
What is a coin?
Next in sequence: 8, 5, 4, 9, 1, 7, ___
What is 6 (in alphabetical order of numbers)
If all Bloops are Razzies, and all Razzies are Lazzies, are all Bloops definitely Lazzies?
What is yes?
A grandfather, two fathers, and two sons went to a baseball game together and bought only three tickets. How is that possible?
What is they are three people: grandfather (also a father), father (also a son), and son?
If you divide 30 by 1/2 and add 10, what’s the answer?
What is 70
What can you catch but not throw?
What is a cold?
If 1 = 5, 2 = 25, 3 = 325, 4 = 4325, then 5 = ?
What is 1 (the pattern is the question itself)
A bat and a ball cost $1.10. The bat costs $1.00 more than the ball. How much is the ball?
What is $0.05?
I am a three-digit number. My tens digit is five more than my ones digit. My hundreds digit is eight less than my tens digit. What number am I?
What is 194?
You have three boxes: one with apples, one with oranges, and one with both. All are labeled incorrectly. You can reach into one box to pull out one fruit. How can you label them correctly?
What is: Pick from the box labeled “both.” Whatever you pull (e.g., apple), that box is apples. Then relabel the rest logically.