Brain Teasers and Puzzles

647 topics in this forum

1. Prime generating polynomial

   By Genady, November 9
   • 9 replies
   • 481 views
   • 
   • Genady
   • Sunday at 08:14 PM

2. Which two 4-digit numbers multiply to give 4^8 + 6^8 + 9^8?

   By Genady, November 5
   • 5 replies
   • 276 views
   • 
   • Genady
   • November 6

3. How do YOU solve this equation?

   By Genady, November 3
   • 12 replies
   • 387 views
   • 
   • Genady
   • November 4

4. "if 2 is not equal to 5"

   By Genady, October 21
   • 7 replies
   • 1.1k views
   • 
   • Genady
   • October 22

5. Puzzle for the Day 1 2 3 4

   By Commander, April 21, 2023
   • 88 replies
   • 8.9k views
   • 
   • joigus
   • September 10

6. Find the Area !

   By Commander, July 30
   • 2 replies
   • 972 views
   • 
   • Commander
   • August 20

7. My grandfather got this puzzle in the 1970's.

   By JohnDBarrow, August 7
   • 1 reply
   • 805 views
   • 
   • JohnDBarrow
   • August 8

8. Doorstep Survey

   By toucana, August 3
   • 7 replies
   • 659 views
   • 
   • Externet
   • August 4

9. Layout !

   By Commander, July 15
   • 0 replies
   • 769 views
   • 
   • Commander
   • July 15

10. Which came first, the chicken or the egg? 1 2

    By Jalopy, March 2, 2022
    • 27 replies
    • 7.1k views
    • 
    • TheVat
    • April 21

11. Dividing money brain teaser 1 2

    By nowimcalm, April 10, 2010
    • 30 replies
    • 9.8k views
    • 
    • D_G
    • March 17

12. Find the angle

    By Genady, September 16, 2023
    • 7 replies
    • 2.4k views
    • 
    • swansont
    • January 27

13. Random choice question

    By Genady, September 26, 2023
    • 5 replies
    • 2.5k views
    • 
    • Growl
    • January 26

14. Fuel consumption as an area 1 2

    By Arthur Smith, October 4, 2023
    • 35 replies
    • 2.9k views
    • 
    • Arthur Smith
    • October 6, 2023

15. Cube and Spheres

    By Commander, September 10, 2023
    • 9 replies
    • 1.4k views
    • 
    • Commander
    • September 11, 2023

16. Floating hourglass

    By Genady, September 10, 2023
    • 15 replies
    • 1.6k views
    • 
    • TheVat
    • September 11, 2023

17. Circles on a string

    By Genady, September 9, 2023
    • 13 replies
    • 1.6k views
    • 
    • Genady
    • September 10, 2023

18. What is the mathematical equation in 2D and 3D for your body?

    By Z.10.46, August 14, 2023
    • 3 replies
    • 1.3k views
    • 
    • mistermack
    • August 20, 2023

19. Cube Cuts !

    By Commander, August 18, 2023
    • 10 replies
    • 1.3k views
    • 
    • Commander
    • August 19, 2023

20. Fraction

    By Commander, August 8, 2023
    • 11 replies
    • 1.5k views
    • 
    • Commander
    • August 17, 2023

21. Traffic, roads, and travel time

    By Genady, August 14, 2023
    • 8 replies
    • 1.3k views
    • 
    • TheVat
    • August 15, 2023

22. How to meet every patient once?

    By Genady, August 12, 2023
    • 2 replies
    • 1.7k views
    • 
    • Genady
    • August 12, 2023

23. Clock on an escalator

    By Genady, August 8, 2023
    • 4 replies
    • 1.2k views
    • 
    • joigus
    • August 9, 2023

24. Share a Riddle

    By MSC, August 8, 2023
    • 2 replies
    • 849 views
    • 
    • MSC
    • August 8, 2023

25. Geometry - no equations needed

    By Genady, August 1, 2023
    • 16 replies
    • 1.7k views
    • 
    • Genady
    • August 2, 2023