A good riddle is a two-minute workout for the brain: students have to read carefully, question assumptions and think from a new angle. These riddles for high school students work as warm-ups, brain breaks or rewards for early finishers. Answers are included after each section.
In this guide6 sections
Word riddles
- What has keys but can’t open locks?
- What gets wetter the more it dries?
- What has a neck but no head?
- What can you catch but not throw?
- What word becomes shorter when you add two letters to it?
- What has many teeth but can’t bite?
- What runs but never walks?
- What has one eye but can’t see?
- What belongs to you but is used more by others?
- What starts with “e,” ends with “e,” and usually contains one letter?
Answers: 1. A piano. 2. A towel. 3. A bottle. 4. A cold. 5. “Short.” 6. A comb. 7. A river. 8. A needle. 9. Your name. 10. An envelope.
Logic riddles
- A man is looking at a photo. “Brothers and sisters I have none, but that man’s father is my father’s son.” Who is in the photo?
- What comes once in a minute, twice in a moment, but never in a thousand years?
- The more you take, the more you leave behind. What are they?
- What can travel around the world while staying in a corner?
- If you have me, you want to share me. If you share me, you don’t have me. What am I?
- What has cities but no houses, forests but no trees, and water but no fish?
- What is full of holes but still holds water?
- Forward I am heavy, backward I am not. What am I?
- What has hands but can’t clap?
- What goes up but never comes down?
Answers: 11. His son. 12. The letter “m.” 13. Footsteps. 14. A stamp. 15. A secret. 16. A map. 17. A sponge. 18. A ton (“not” backward). 19. A clock. 20. Your age.
Math riddles
- I am an odd number. Take away one letter and I become even. What number am I?
- How many times can you subtract 5 from 25?
- A farmer has 17 sheep. All but 9 run away. How many are left?
- If two’s company and three’s a crowd, what are four and five?
- What three positive numbers give the same result when multiplied and added together?
- A bat and a ball cost $1.10 total. The bat costs $1.00 more than the ball. How much is the ball?
- How can you add eight 8s to get 1,000?
- What number do you get when you multiply all the numbers on a phone keypad?
- If there are three apples and you take away two, how many do you have?
- Which weighs more: a pound of feathers or a pound of bricks?
Answers: 21. Seven (remove “s”). 22. Once; after that you subtract from 20. 23. Nine. 24. Nine. 25. 1, 2 and 3. 26. 5 cents. 27. 888 + 88 + 8 + 8 + 8. 28. Zero (the keypad includes 0). 29. Two. 30. They weigh the same.
Science riddles
- What gets bigger the more you take away from it?
- What can fill a room but takes up no space?
- I’m lighter than air, but a million people can’t lift me. What am I?
- What has a head and a tail but no body?
- What travels faster: heat or cold?
- What goes up when rain comes down?
- I have no life, but I can die. What am I?
- What is always in front of you but can’t be seen?
- What breaks when you say it?
- What can you hold in your right hand but never in your left?
Answers: 31. A hole. 32. Light. 33. A bubble. 34. A coin. 35. Heat (you can “catch” a cold). 36. An umbrella. 37. A battery. 38. The future. 39. Silence. 40. Your left hand (or left elbow).
How to use riddles in class
| Use | How |
|---|---|
| Warm-up | Post one riddle as part of your bell ringer. |
| Brain break | Teams race to solve three riddles in two minutes. |
| Early finishers | Keep a riddle card stack on a side table. |
| Friday challenge | A harder riddle all week; reveal the answer Friday. |
Frequently asked questions
Are riddles good for high school students?
Yes. Riddles build careful reading, flexible thinking and attention to wording, and they make quick, low-stress warm-ups.
How long should a riddle activity take?
Two to five minutes is ideal for a warm-up or brain break.
For longer challenges, try our logic puzzles for teens and brain break games.
