 # Math Riddles

A collection of Math Riddles for fun and pleasure! Tease your brain with these riddles, then click to show or hide the answer. (Note: You may need to enable JavaScript on your browser for the answers to show properly.)

Also visit our Math Trivia page for more arithmetic riddles, algebra riddles, geometry riddles, statistics riddles etc.

1. Why should you never mention the number 288 in front of anyone? 2. Which weighs more?  A pound of iron or a pound of feathers? 3. How is the moon like a dollar? 4. What is alive and has only 1 foot? 5. When do giraffes have 8 feet? 6. How many eggs can you put in an empty basket? 7. What coin doubles in value when half is deducted? 8. What is the difference between a new penny and an old quarter? 9. If you can buy eight eggs for 26 cents, how many can you buy for a cent and a quarter? 10. Where can you buy a ruler that is 3 feet long? 1. If there were 9 cats on a bridge and one jumped over the edge, how many would be left? 2. If you take three apples from five apples, how many do you have? 3. What has 4 legs and only 1 foot? 4. How many times can you subtract 6 from 30? 5. If one nickel is worth five cents, how much is half of one half of a nickel worth? 6. How many 9's between 1 and 100? 7. Which is more valuable - one pound of \$10 gold coins or half a pound of \$20 gold coins? 8. It happens once in a minute, twice in a week, and once in a year. What is it? 9. How can half of 12 be 7? 10. When things go wrong, what can you always count on? 11. Which month has 28 days? 12. What’s the easiest way to double your money? 13. What occurs twice in a week, once in a year but never in a day? 14. Where do fish keep their money? 15. Why is the longest human nose on record only 11 inches long? 16. Why are diapers like 100 dollar bills? 17. A street that is 40 yards long has a tree every 10 yards on both sides. How many trees are there on the entire street? 18. What goes up and never comes down? 19. What did one math book say to the other math book? 20. I am an odd number; take away a letter and I become even. What number am I? 21. As I was going to St. Ives
I met a man with seven wives.
Kits, cats, sacks and wives,
How many were going to St. Ives? 22. You want to cross a bridge to get to the other side of the crevice, but there's a problem. The bridge, which takes an hour to walk across, is guarded in the middle by a guard who wakes up every half hour and carries back anybody crossing the bridge back to where he or she came from. How long does it take for me to get to the other side? 23. What are the 10 types of people in the world? 24. Why didn't the quarter roll down the hill with the nickel? 25. What happened to the plant in math class? 26. Why did the chicken cross the mobius strip? 27. Why did I divide sin by tan? 28. Where do math teachers go on vacation? 29. What do you call a number that can't keep still? 30. Why did the mutually exclusive events break up? 31. How does a mathematician induce good behavior in her children? 32. How do you know when you've reached your Math Professors voice-mail? 33. Why did the 30-60-90 triangle marry the 45-45-90 triangle? 34. Why didn't the Romans find algebra very challenging? 35. Why couldn't the angle get a loan? 36. What do you call an angle that is adorable? 37. What do you call a destroyed angle? 38. Why did the student get upset when his teacher called him average? 39. Why does nobody talk to circles? 40. Which triangles are the coldest? 41. What do you call a dead parrot? 42. What's the difference between a diameter and a radius? 43. How do deaf mathematicians communicate? 44. What do organic mathematicians throw into their fireplaces? 45. Why shouldn't you argue with a decimal? 46. How many mathematicians does it take to change a light bulb? 47. Why did the chicken cross the road? 48. What did the circle say to the tangent line? 49. Why do mathematicians like parks? 50. What kind of tree could a math teacher climb? Rotate to landscape screen format on a mobile phone or small tablet to use the Mathway widget, a free math problem solver that answers your questions with step-by-step explanations.

You can use the free Mathway calculator and problem solver below to practice Algebra or other math topics. Try the given examples, or type in your own problem and check your answer with the step-by-step explanations. 