🧮 Number Puzzles
I am a three-digit number. The sum of my digits is 12. My tens digit is twice my hundreds digit. My ones digit is two more than my tens digit. What number am I?
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246.
I am a three-digit number with a tens digit of 0 and a ones digit of 1. Reverse my digits and subtract the smaller number from the larger to get 297. What number am I?
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401.
Three consecutive integers add up to 177. What are they?
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58, 59, and 60.
A shopkeeper buys an item for $60 and sells it for $70. Then he buys it back for $80 and sells it again for $90. How much profit did he make?
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$20 profit.
If 8 workers take 10 days to build a wall, how many days would 10 workers take, assuming equal efficiency?
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8 days.
If 3x + 5 = 26, what is 6x + 10?
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52.
A sequence goes 2, 4, 7, 11, 16. What is the next term?
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22.
The product of three consecutive integers is 990. What are they?
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9, 10, and 11.
If the perimeter of a rectangle is 50 and the length is 15, what is the width?
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10.
I am a two-digit prime number less than 50. The sum of my digits is 10. When you reverse me, you get another prime. What number am I?
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37.
📊 More Math Challenges
A train travels 60 mph for 2 hours and 40 mph for 3 hours. What is the average speed for the entire trip?
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48 mph.
What is the smallest positive number divisible by both 12 and 15?
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60.
If 5 cats can catch 5 mice in 5 minutes, how many cats are needed to catch 100 mice in 100 minutes?
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Still 5 cats.
I am a number that is the square of a prime and also the sum of two consecutive primes. What number am I?
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25.
If 2^x = 128, what is 2^(x+1)?
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256.
If two's company and three's a crowd, what are four and five?
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Nine.
A farmer has 17 sheep and all but 9 run away. How many are left?
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9.
How can you add eight 8s and get the number 1,000?
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888 + 88 + 8 + 8 + 8 = 1,000.
If you multiply me by any other number, the answer always remains the same. What number am I?
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0.
How many months have 28 days?
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All of them.
🔢 Logic and Patterns
What comes once in a minute, twice in a moment, but never in a thousand years?
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The letter M.
You see me once in June, twice in November, and not at all in May. What am I?
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The letter E.
Forward I am heavy, backward I am not. What am I?
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Ton.
What belongs to you but others use more than you do?
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Your name.
What question can you never answer yes to?
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Are you asleep yet?
I am the whiteboard covered in equations at math club. What am I?
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A math club board.
I am the engineering standup debating two solution paths. What am I?
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A team discussion.
I am the escape room puzzle solved with algebra. What am I?
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A math escape clue.
I am the pub quiz bonus round stumping the table. What am I?
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A trivia challenge.
I am the aha moment when the number pattern clicks. What am I?
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A breakthrough.
📘 Use these riddles for:
- Adult math club showdowns and brain-training newsletters
- Escape room prep nights and engineering standups
- Trivia or pub quiz bonus rounds
- Whiteboard debates with multiple solution paths
- Newsletter features for puzzle-loving subscribers
FAQ
Do I need advanced math?
Most use algebra, arithmetic, or logic.
Good for teams?
Yes. Debating strategies is half the fun.
Want non-math hard riddles?
See hard riddles for adults.