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Brain Teasers and Puzzles

Exercise your brain with these user-submitted puzzlers!

653 topics in this forum

  1. Find square root of 5 from the sum of square root of 5 and that of 7

    By Genady,
    • 2 replies
    • 2.5k views

  2. Is H a normal subgroup...

    By Genady,
    • 8 replies
    • 952 views
    • KJW
    • KJW

  3. How are the orders in a cyclic group related?

    By Genady,
    • 4 replies
    • 513 views

  4. Is being closed a sufficient condition for a finite subset to be a subgroup?

    By Genady,
    • 4 replies
    • 458 views

  5. Do equivalence classes form a partition?

    By Genady,
    • 7 replies
    • 521 views
    • KJW
    • KJW

  6. Friday the 13th

    By TheVat,
    • 7 replies
    • 906 views

  7. Prime generating polynomial

    By Genady,
    • 9 replies
    • 1.4k views

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

    By Genady,
    • 5 replies
    • 816 views

  9. How do YOU solve this equation?

    By Genady,
    • 12 replies
    • 1.1k views

  10. "if 2 is not equal to 5"

    By Genady,
    • 7 replies
    • 3.3k views

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

    By JohnDBarrow,
    • 1 reply
    • 1.3k views

  12. Doorstep Survey

    By toucana,
    • 7 replies
    • 1.2k views

  13. Find the Area !

    By Commander,
    • 2 replies
    • 1.4k views

  14. Layout !

    By Commander,
    • 0 replies
    • 1.2k views

  15. Fuel consumption as an area 1 2

    By Arthur Smith,
    • 35 replies
    • 3.8k views

  16. Random choice question

    By Genady,
    • 5 replies
    • 3k views

  17. Find the angle

    By Genady,
    • 7 replies
    • 2.9k views

  18. Floating hourglass

    By Genady,
    • 15 replies
    • 2.2k views

  19. Cube and Spheres

    By Commander,
    • 9 replies
    • 2k views

  20. Circles on a string

    By Genady,
    • 13 replies
    • 2.2k views

  21. Cube Cuts !

    By Commander,
    • 10 replies
    • 1.9k views

  22. Traffic, roads, and travel time

    By Genady,
    • 8 replies
    • 1.6k views

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

    By Z.10.46,
    • 3 replies
    • 1.7k views

  24. How to meet every patient once?

    By Genady,
    • 2 replies
    • 1.9k views

  25. Share a Riddle

    By MSC,
    • 2 replies
    • 1k views
    • MSC
    • MSC
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