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The Trickiest and Most Mind-twisting Mathematics Questions

Published by CHAN LEE PENG in Quizzes
October 22nd, 2008

How good is your math? Are you up for a challenge? Try solving these riddles.

“The sign of a good maths puzzle is one where you haven’t a
clue where to begin searching for a solution – one which at first sight looks a
nightmare, and with which a further look drives one to despair” – Mr Know-it-all (2001)

Below were questions prepared and designed by me. If you can’t answer the questions, please don’t fire at me, huh…Wassup, don’t show me your sour face, smile a bit, will you?

Well, I’ve worked out these questions for certain days. Now, it’s your turn to have your mind twisted while trying to solve these Mathematical questions. I assure you that these questions will keep your brain staying active to delay aging process. Regardless of your ages, occupations, and qualifications, you’re invited to challenge yourself with these trickiest questions. Do tell me your score, por favor (“please” in Spanish)!

Now, get yourself ready, sit still, and here we go…Good luck!

Mathematics Questions

  1. Given that 1 = 5, 2 = 15, 3 = 125, 4 = 1235, find the value of 5
  2. James needs 15 days to assembly bulks of accessories for a car, but Dave needs only 12 days to accomplish the task. Now, let me ask you how much more pieces of accessories does Dave manage to accomplish as compared to James?
  3. Given that a + b = c = 10. Now, find the value of 2a + a + 3b.
  4. How to get 24 from the four whole numbers of 10,10, 10 and 3? You can apply addition, subtraction, multiplication and division to get the answer
  5. How to get 10 from the four whole numbers of 1,1,9 and 9?
  6. What’s the proper way to calculate 8-1-3x/2 = 0?
  7. Calculate the value of 4x³-2x²-3x+1=0
  8. Try to simplify this equation (10-2X)*(6-2X )*X in its mathematical form
  9. There’re 16 small squares in one big square. How many squares are they in total?

  10. Without using calculator, calculate 9,9,9 and 1 to get 100. You can apply addition, subtraction, multiplication and division to get the answer.

  11.  Now, challenge yourself by using addition, subtraction, division or multiplication to calculate 1,3,4, and 6 to obtain 21

  12.  Again, using addition, subtraction, division or multiplication, calculate the whole numbers of 5,6,2 and 9 to obtain 11

  13.  How do you obtain 100 with 9,9,9 and 9? You can arrange the 9 digit in the position as you like

  14.  How do you obtain 24 with digit numbers of 5, 5, 5 and 1?

  15.  How do you obtain 24 with digit numbers of 3,3,8 and 8?

  16.  Using addition, subtraction, division and multiplication, find the answer of 21 from the digit numbers of 5,5,5,5 and 5?

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38 Comments
  1. BC Doan
    Posted October 22, 2008 at 9:56 am

    Great fun in trying to figure out the answers!

  2. valli
    Posted October 22, 2008 at 11:26 am

    Trickiest questions.

  3. goodselfme
    Posted October 22, 2008 at 1:27 pm

    I could not even accept the answers with confidence. You are a wiz kid!

  4. hackmix2009
    Posted October 22, 2008 at 2:41 pm

    muy bueno

  5. C. Jordan
    Posted October 22, 2008 at 5:12 pm

    Forgot to say that I scored well below 40!

  6. Lauren Axelrod
    Posted October 22, 2008 at 5:31 pm

    Yikes, these problems scare me. Great piece Chan

  7. Enzo Silvestri
    Posted October 22, 2008 at 6:35 pm

    Ha ha ha
    I worked out the answer of 12345, I solved it holistically, but then I scrolled down to tell you and I saw that you give the answers…

  8. Enzo Silvestri
    Posted October 22, 2008 at 6:40 pm

    #2 James is lazier than Dave…heh sorry

  9. Judy Sheldon
    Posted October 22, 2008 at 7:48 pm

    Wow, Chan, you had us back in class. I was so glad to get out of algebra class as it was! Maybe I should email this to my algebra instructor. He actually loves the subject.

    Thanks and God bless.

  10. CHAN LEE PENG
    Posted October 22, 2008 at 8:26 pm

    The answer for question 11 is 21. And the calculations are:
    (1+4)*3+6=21
    6 x 3 + 4 -1 = 21

    I’ve submitted the fix, sorry for the typing errors.

  11. jhenz
    Posted October 22, 2008 at 8:39 pm

    i never really like math that much, but hey… everywhere we go, we deal with it, so i better deal with it now. :) no choice.

  12. Chris Stonecipher
    Posted October 22, 2008 at 9:53 pm

    This looks like fun, but I deserve an F. Great peice Chan!

  13. swapna
    Posted October 23, 2008 at 1:36 am

    dear chan, nice funny calculations…

  14. Leo Reyes
    Posted October 23, 2008 at 1:42 am

    Those are real brain twisters. Great article.

  15. Verity
    Posted October 23, 2008 at 1:49 am

    Wow… Nice questions. I answered only about 10 of them correctly. Great one!

  16. desmonrock21
    Posted October 23, 2008 at 7:39 am

    the question number 9 is 30?

  17. Christine Ramsay
    Posted October 23, 2008 at 8:17 am

    These are going to keep me busy for a while -a few years I should think. Great questions

  18. RJ Evans
    Posted October 24, 2008 at 4:36 am

    Thanks Chan, for *really* making my brain ache! :-) )

  19. Rookie Expert
    Posted October 25, 2008 at 12:55 am

    Gosh, how I hate maths, and for most of your questions even the calculator was of no use. Now im d122y, see how dizzy, im typing numbers instead of alphabets!!

  20. nobert soloria bermosa
    Posted October 25, 2008 at 4:25 am

    interesting,i love math sometimes,but not all the time,lol…

  21. louie jerome
    Posted October 25, 2008 at 2:45 pm

    I’m too lazy to work all those out!

  22. Posted November 1, 2008 at 4:07 pm

    oh,it’s really tricky..good work!

  23. Posted November 4, 2008 at 12:23 am

    Wow! Those were hard

  24. danny m
    Posted November 6, 2008 at 1:58 pm

    complicated, hard and had 2 think 500 miles out of box, but plz chan name ur next next piece 16 slightly easier math qestions, but had gud fun answering :-S… so confused… only speak… fragments… days… coz hard… work out things

  25. Posted November 10, 2008 at 11:29 pm

    That was fun! Thanks!

    Inna

  26. Posted November 14, 2008 at 1:04 pm

    Wow. Math problems = instant headache.

  27. Posted November 21, 2008 at 9:58 pm

    Hahah – I like Brian James’ comment *:) – - Another great article – exercising your mind will keep you young forever!

    Blessings.

    Sincerely,

    -Liane Schmidt.

  28. Posted January 8, 2009 at 8:41 am

    Because I went through from basic to advance math in the university, and not to appear arrogant, these questions in my opinion are not that trickiest nor the most mind-twisting.It’s only up to basic algebra in level. A beautiful and great article though.

  29. ilsa ahmad
    Posted August 12, 2009 at 8:57 am

    that was was stupid
    those were sooooo easy

  30. Waqas
    Posted March 3, 2010 at 3:18 pm

    really hard
    great job
    thumbs up to u CHAN

  31. Pat
    Posted August 28, 2010 at 1:34 pm

    Is the second answer 30?

  32. Posted October 2, 2010 at 8:49 am

    WoW maN ! BRIllianT questIOns ATLEASt nT for Bulky BraINS

  33. faizan
    Posted October 21, 2010 at 7:47 pm

    haha..hey, i can solve all questions easily..it take me approximately 1 minute to solve each question..thank to the developer..

  34. faizan
    Posted October 21, 2010 at 7:49 pm

    hey, i can solve all questions easily..it take me approximately 1 minute to solve each question..thank to the developer..

  35. COolstar
    Posted November 27, 2010 at 3:47 am

    what is the answer to question 4?

  36. Posted March 1, 2011 at 12:16 pm

    ans for Q.1) IS 5=1 which is already given….

  37. Posted March 1, 2011 at 12:25 pm

    Ans for Q3) is 2a+a+3b=3a+3b=3(a+b)=3(10)=30

  38. MADHUBALA
    Posted April 26, 2011 at 1:45 pm

    ANSWER OF Q13.-99+9/9=100

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