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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
    • 1.4k views

  2. Is H a normal subgroup...

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

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

    By Genady,
    • 4 replies
    • 247 views

  4. Do equivalence classes form a partition?

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

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

    By Genady,
    • 4 replies
    • 204 views

  6. Friday the 13th

    By TheVat,
    • 7 replies
    • 602 views

  7. Prime generating polynomial

    By Genady,
    • 9 replies
    • 1.1k views

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

    By Genady,
    • 5 replies
    • 596 views

  9. How do YOU solve this equation?

    By Genady,
    • 12 replies
    • 811 views

  10. "if 2 is not equal to 5"

    By Genady,
    • 7 replies
    • 2.9k views

  11. Puzzle for the Day 1 2 3 4

    By Commander,
    • 88 replies
    • 9.8k views

  12. Find the Area !

    By Commander,
    • 2 replies
    • 1.2k views

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

    By JohnDBarrow,
    • 1 reply
    • 1k views

  14. Doorstep Survey

    By toucana,
    • 7 replies
    • 903 views

  15. Layout !

    By Commander,
    • 0 replies
    • 973 views

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

    By Jalopy,
    • 27 replies
    • 7.5k views

  17. Dividing money brain teaser 1 2

    By nowimcalm,
    • 30 replies
    • 10.3k views
    • D_G
    • D_G

  18. Find the angle

    By Genady,
    • 7 replies
    • 2.7k views

  19. Random choice question

    By Genady,
    • 5 replies
    • 2.8k views

  20. Fuel consumption as an area 1 2

    By Arthur Smith,
    • 35 replies
    • 3.3k views

  21. Cube and Spheres

    By Commander,
    • 9 replies
    • 1.7k views

  22. Floating hourglass

    By Genady,
    • 15 replies
    • 1.9k views

  23. Circles on a string

    By Genady,
    • 13 replies
    • 1.9k views

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

    By Z.10.46,
    • 3 replies
    • 1.5k views

  25. Cube Cuts !

    By Commander,
    • 10 replies
    • 1.6k views
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