Sumthing’s Up

One day your minimalist friend is visiting, and she presents you with the numbers 2, 3, 4 and 5, and the symbols = and +, and the following tantalizing challenge:ย  It is possible to use each number and symbol once and only once and end up with a true equation; further, you cannot use any number or symbol not given. How can you do this?

Communicated by Samantha Bergh, who heard it from a Wisconsin math teacher, who believes he read it on a Cheerios box.

204 Comments

  1. sophie on February 27, 2021 at 5:34 am

    hi mr miller ur problems are too hard for me and i cant solve any but im trying rlly hard im sad cause im not smart can u teach me how to become smarter so i can solve them



  2. Steven Miller on May 30, 2019 at 7:11 pm

    To: [email protected]
    NO, email me at [email protected] to discuss



  3. Steven Miller on April 9, 2019 at 3:07 pm

    cannot use and. also email address is not working: email me at [email protected]



  4. isaac on April 9, 2019 at 3:06 pm

    2+5=3 and 4



  5. Steven Miller on May 20, 2018 at 1:01 am

    your email address doesn’t work — this is wrong as only have one plus sign



  6. UGOODBRO on May 19, 2018 at 11:15 pm

    2+5=3+4



  7. Steven Miller on April 29, 2018 at 1:14 am

    sorry you feel this is rubbish

    this is to give people the joy of solving it and not just running to the answers

    your answer, sadly, is wrong. you do not have a square-root as you need more than just a 2 for that, you need some line
    segments….

    also your email didn’t work….



  8. Math Guru on April 29, 2018 at 1:05 am

    Answer is 3 2= 4+5, where is square root of 3 is equal to 9, which can be equated to 4 + 5. Answer should have been given, instead of wasting peples time while forcing them to send a personal email, total rubbish.



  9. Steven Miller on March 21, 2018 at 1:20 pm

    Email me (sjm1 AT williams.edu) with a real email address if you want a hint



  10. abraham on March 21, 2018 at 12:20 pm

    answer?



  11. Steven Miller on November 18, 2016 at 7:06 pm

    To: [email protected]
    Message: Correct, email bounced



  12. Alex on November 18, 2016 at 6:58 pm

    3^2=5+4

    “Drops Mic”



  13. Steven Miller on November 11, 2016 at 12:14 am

    To: Hello: Email me at [email protected]



  14. Steven Miller on April 27, 2016 at 2:18 am

    sadly no as this requires two plus signs and you only have one. ..s



  15. Kaelan on April 27, 2016 at 1:52 am

    Is it 3+4=2+5?

    Because both sides simplify to equal 7 meaning that both sides are equal.



  16. Steven Miller on September 30, 2015 at 8:50 pm

    nope
    an X looks different than a + sign
    is a way to do it…



  17. Lucas on September 30, 2015 at 4:07 pm

    can you rotate the addition sign to make it x and then make it
    23x=45
    —- —
    23 23
    x=45/23
    and the answer would be 45/23’s
    is this correct?????



  18. Steven Miller on July 14, 2015 at 8:39 pm

    Hints sent — always feel free to email me at [email protected] for hints, and for the password to the student / teacher webpage. ..s



  19. Natalie on July 9, 2015 at 1:15 am

    I’d love more hints and solutions. I am going to use these with the students that I tutor. Once they do some work, I give them math riddles at the end as their “fun” ending to our lesson and I know these will stump them and they’ll love it. Problem is…they are stumping me too! Send me hints and solutions to the Sumthin’s Up and Palindrome problems please.

    Thank you zillions for these!
    Natalie



  20. Steven Miller on May 13, 2015 at 1:23 pm

    You can email me at sjm1 AT williams.edu for hints; if that doesn’t work I’ll send a soln.



  21. mindy on May 12, 2015 at 4:17 pm

    Is their anywhere I can get the solutions to the riddles?



  22. Steven Miller on April 18, 2015 at 1:21 am

    yes



  23. Steven Miller on April 18, 2015 at 1:21 am

    To:la ergerg.com [email protected]
    Your solns are correct but emails to you bounce. Please email me at sjm1 AT williams.edu



  24. Raghavan on April 9, 2015 at 3:54 pm

    Do you have to use all the numbers? ๐Ÿ™‚



  25. Steven Miller on August 1, 2014 at 2:19 am

    can’t use the 2



  26. C on June 25, 2014 at 6:45 pm

    21\7*5+6\1=21



  27. Steven Miller on March 5, 2014 at 9:03 pm

    Glad you’re enjoying.



  28. resistance band only workout on March 5, 2014 at 8:53 pm

    My family all the time say that I am wasting my time here at net, but I know I am
    getting knowledge everyday by reading thes pleasant articles or reviews.



  29. Steven Miller on October 31, 2013 at 7:01 pm

    just checking in on how things are going — sjm1 AT williams.edu



  30. Donna Reaves on October 8, 2013 at 10:40 am

    Hello Professor Miller,

    My name is Donna Reaves, and I teach 5th Grade Math at East Elementary School in Greenwood, MS. On our test each Friday, there is a riddle for students to work on for bonus points. Last week, we used this riddle, so we voted on Monday to send you three of the possible solutions that several students found. We appreciate any comments you may have for us. Our solutions are as follows:

    Solution # 1:

    23 + 45 = (many students came up with this and realize that the equation is not balanced, but we wanted to get your comments anyway!)

    Solution # 2:

    4 * 2 = 5 + 3 (Is the dot when used for multiplication considered to be a symbol?)

    Solution # 3:

    4/2 + 3 = 5 (Is the division line in a fraction considered to be a symbol?)

    Again, thank you for your comments!

    Best,
    Donna Reaves and the East Elementary 5th Grade Class



  31. Steven Miller on August 29, 2013 at 2:24 pm

    No: email to you bounces: I’m sjm1 AT williams.edu



  32. zachery on August 29, 2013 at 1:28 pm

    yes if the numbers are put togeather



  33. Steven Miller on August 27, 2013 at 3:00 am

    yes



  34. lar on August 26, 2013 at 9:33 pm

    do you have to use all symbols



  35. Lesah McMullen on August 26, 2013 at 8:11 pm

    I just found this page and love it. Can I get a solution to this? Do you have a solutions page or will I need to keep bothering you ๐Ÿ˜‰



  36. Steven Miller on August 23, 2013 at 12:37 am

    tb: your email address doesn’t work but you are correct



  37. Steven Miller on May 17, 2013 at 5:54 am

    Mrog: you are correct but email to you bounced. //s



  38. Steven Miller on May 2, 2013 at 2:56 pm

    very very original, but there is a solution without breaking the + apart



  39. Dallas on April 29, 2013 at 1:04 am

    Can you break apart the plus sign and make it
    5-4=3-2



  40. Steven Miller on March 28, 2013 at 8:05 pm

    Did you get my email? sjm1 AT williams.edu



  41. Chassidy on March 28, 2013 at 4:39 am

    Can I please have a hint and the soln?
    This is for a math project!



  42. Steven Miller on November 29, 2012 at 1:51 am

    anonymous: correct, email me at sjm1 AT williams.edu to discuss problems



  43. Steven Miller on November 19, 2012 at 11:56 pm

    You can do math and dancing: http://vimeo.com/47049144



  44. paige hyland on November 19, 2012 at 11:34 pm

    I only like dancing i don’t know why i am even on this web site.



  45. Steven Miller on November 7, 2012 at 8:29 pm

    It is — sjm1 AT williams.edu



  46. Steven Miller on October 12, 2012 at 3:08 pm

    It can — sjm1 AT williams.edu



  47. Annie on October 12, 2012 at 2:05 pm

    It can’t be done, can it?



  48. Steven Miller on September 14, 2012 at 3:02 am

    sam: sam: well done (sjm1 AT williams.edu)



  49. Steven Miller on September 11, 2012 at 2:02 pm

    sending hint



  50. bilal on September 10, 2012 at 7:16 pm

    Can you please send me a hint and the answer.



  51. Steven Miller on August 28, 2012 at 1:28 am

    hint sent (sjm1 AT williams.edu)



  52. hiba on August 25, 2012 at 4:32 pm

    can you pls email me the answer



  53. Steven Miller on August 19, 2012 at 3:03 am

    very clever, but there’s a soln using the numbers as is (sjm1 AT williams.edu)



  54. Anonymous on August 17, 2012 at 9:57 pm

    I told this to my brother.
    He said that if you turn the + on its side, you can do
    x=2345



  55. Steven Miller on August 17, 2012 at 7:59 pm

    to anonymous: well done! (sjm1 AT williams.edu)



  56. Steven Miller on August 17, 2012 at 12:48 am

    slide: well done!



  57. Steven Miller on August 15, 2012 at 1:30 pm

    The big LEH: well done! not posting as it’s the soln (sjm1 AT williams.edu)



  58. Steven Miller on July 24, 2012 at 5:15 am

    well done Anonymous Submitted on 2012/07/24 at 3:40 am



  59. figue on July 11, 2012 at 11:19 pm

    please give me the answer im very desesperated plz



  60. Steven Miller on June 25, 2012 at 2:59 am

    that requires two additions and you only have one; email me at sjm1 AT williams.edu to chat more



  61. Anonymous on June 24, 2012 at 7:32 pm

    3+4=5+2 is what i think it to be, if wrong kindly send the right answer



  62. Steven Miller on June 13, 2012 at 1:15 am

    Not seeing how this works — can you elaborate?



  63. M on June 12, 2012 at 1:30 pm

    Is 534+2= correct



  64. Steven Miller on June 4, 2012 at 1:17 am

    Mona: correct, not posting as it’s the answer



  65. Steven Miller on June 4, 2012 at 1:14 am

    not sure why this works — can you email me (sjm1 AT williams.edu)? /s



  66. Steven Miller on June 3, 2012 at 3:05 am

    Kyle: correct, not posting as this is the answer



  67. Steven Miller on June 3, 2012 at 3:05 am

    send me your email and I’ll send a hint: sjm1 AT williams.edu



  68. lil prince on June 2, 2012 at 11:05 am

    Plz email me the answer



  69. Chris on June 1, 2012 at 7:24 pm

    534 + 2 =



  70. Steven Miller on June 1, 2012 at 7:14 pm

    MNmathteach: correct. Not posting as it’s the soln.



  71. Steven Miller on May 31, 2012 at 1:22 am

    VERY original, but as you say no = and thus not the ‘simple’ soln that exists…. (note: the formatting might not appear properly: the 2 is over the + and the 5 is under)



  72. Krista Martens on May 30, 2012 at 2:48 pm

    Can you please send me the solution? Probably will be obvious, but… not now!

    2
    3 + 4
    5 but, no “=” sign! sigh!

    (Web site is not published other than the general school info)



  73. Steven Miller on May 29, 2012 at 1:21 am

    nope



  74. Andrew on May 28, 2012 at 12:54 pm

    Can we use brackets?



  75. Steven Miller on May 24, 2012 at 1:39 pm

    you’ve added a comma, can’t do that



  76. blah on May 24, 2012 at 7:16 am

    3+4=2,5



  77. Anonymous on May 15, 2012 at 7:56 pm

    send me a hint please



  78. Steven Miller on May 14, 2012 at 2:40 am

    yes



  79. Amy on May 13, 2012 at 4:42 pm

    Are the comma’s counted as symbols?



  80. Steven Miller on May 11, 2012 at 2:05 pm

    let me email you a hint first — if that doesn’t help I’ll send the soln ..s



  81. stephanie on May 11, 2012 at 12:04 pm

    Hi, Can you email me the solution please? I’m using this in class next week. Love your site by the way!



  82. Steven Miller on May 11, 2012 at 3:04 am

    no, there’s an exact soln //s (sjm1 AT williams.edu)



  83. Heothix on May 9, 2012 at 9:20 pm

    Not sure if I have gotten it right, but can it be 3,4+2=5? Considering 5,4 can be ‘approximately’ 5?



  84. Steven Miller on May 7, 2012 at 5:30 pm

    sure, will send in a moment are you using these in class?



  85. Vanita Beavers on May 7, 2012 at 5:27 pm

    I love your site! This one is making me pull my hair out! May I have a hint?



  86. Steven Miller on May 4, 2012 at 5:45 am

    good originality, but there’s a much better soln



  87. Rachel on May 4, 2012 at 3:49 am

    can I make the = into a =/= (does not equal) by overlapping the plus onto the equals sign? .. so 42 =/= 35



  88. Steven Miller on May 3, 2012 at 2:27 am

    I’ll send a hint //s



  89. Steven Miller on May 3, 2012 at 12:28 am

    I’ll send a hint/ s



  90. amber on May 2, 2012 at 6:19 pm

    can you email me the answer please?



  91. Steven Miller on April 30, 2012 at 12:52 am

    it’s doable — email me at sjm1 AT williams.edu for a soln / hint



  92. Vicci on April 29, 2012 at 3:05 pm

    It seems impossible! /:



  93. Steven Miller on April 19, 2012 at 12:46 am

    unfortunately this doesn’t work as it uses TWO plus signs, and you only have one at your disposal. //s



  94. Akash on April 19, 2012 at 12:43 am

    4+3=5+2



  95. Steven Miller on April 18, 2012 at 7:57 pm

    bob: correct! not posting as it’s the soln. well done. /s/



  96. Steven Miller on April 17, 2012 at 1:21 am

    sure, sent ..s



  97. Kurt on April 16, 2012 at 4:06 pm

    Hint Please



  98. Steven Miller on April 12, 2012 at 6:19 am

    sure



  99. anonymous on April 12, 2012 at 6:17 am

    what does soln mean
    and can you send me a hint



  100. Steven Miller on April 5, 2012 at 2:50 am

    I’ll send a hint first. //s



  101. iqra on April 4, 2012 at 11:42 pm

    can u email me the answer



  102. Steven Miller on April 4, 2012 at 4:00 pm

    It can — you need to think outside the box.



  103. sauravshakya on April 4, 2012 at 3:53 pm

    this is impossible. it cannot be done by just using the numbers 2 3 4 and 5 and symbols = and +



  104. Steven Miller on April 3, 2012 at 1:52 pm

    Not following this.



  105. Joe Smith on April 2, 2012 at 7:13 pm

    If three people fit in a square, is that not for night?



  106. Steven Miller on March 30, 2012 at 1:21 pm

    xiaomilk: correct, well done. not posting as it’s the soln.



  107. Steven Miller on March 30, 2012 at 2:47 am

    anonymous: correct: not posting as it’s the soln.



  108. Steven Miller on March 30, 2012 at 2:47 am

    you need to use 4 as well….



  109. Anonymous on March 29, 2012 at 11:36 pm

    2+3=5



  110. Steven Miller on March 29, 2012 at 8:17 pm

    nope — you can only use one plus sign



  111. xiaomilk on March 29, 2012 at 1:17 pm

    2+5 = 3+4



  112. Steven Miller on March 28, 2012 at 12:13 pm

    nice — I should put this with the ‘pick up sticks’ riddle….



  113. sauravshakya on March 28, 2012 at 11:30 am

    I have a question for you:
    5+5+5=550
    make this above question valid by adding just one line. (I think you have seen this question before)



  114. Steven Miller on March 24, 2012 at 1:46 pm

    Dee: correct, well done. not posting as this is the soln.



  115. Steven Miller on March 21, 2012 at 2:44 am

    gbnfdb: correct, well done! not posting as it’s the soln



  116. Steven Miller on March 15, 2012 at 2:32 am

    koch: correct, well done!



  117. Steven Miller on March 15, 2012 at 2:30 am

    Becca: you can (not posting your question as it gives away the answer)



  118. Steven Miller on March 15, 2012 at 2:30 am

    email me at sjm1 AT williams.edu for the soln or a hint..s



  119. Anonymous on March 15, 2012 at 1:54 am

    what’s the answer?



  120. Steven Miller on March 12, 2012 at 11:24 am

    but what happened to 4? I’ll send an email. //s



  121. adithyan on March 12, 2012 at 6:39 am

    is the answer “2+3=5” if it is wrong pls answer me the correct one…



  122. Steven Miller on March 9, 2012 at 2:40 am

    sure, will send a hint //s



  123. Anne Bayruns on March 8, 2012 at 10:37 pm

    I need the answer to Sumthings up please. I love your site!
    Anne



  124. Steven Miller on March 7, 2012 at 8:00 pm

    Nice attempt, but you don’t have a division sign….



  125. Kathy on March 7, 2012 at 7:59 pm

    4/2 + 3 = 5



  126. Steven Miller on March 6, 2012 at 11:14 pm

    nice attempt, but you can’t use and.



  127. kevin on March 6, 2012 at 10:11 pm

    2+5 equals 4 and 3



  128. Steven Miller on March 4, 2012 at 12:40 am

    Nope — email me at [email protected] if you want a hint/soln



  129. Anonymous on March 3, 2012 at 3:59 pm

    23+45=



  130. Steven Miller on February 17, 2012 at 4:51 am

    Applejacks: correct! Not posting as its the soln. ..s



  131. Steven Miller on February 11, 2012 at 1:35 am

    Dakota: correct, well done! Not posting as it’s the soln. //s



  132. Steven Miller on January 29, 2012 at 2:08 pm

    big brain — correct, not posting as its the soln



  133. big brain on January 29, 2012 at 9:38 am

    4+5=3^2



  134. Steven Miller on January 20, 2012 at 2:06 am

    To: a 5 year old boy: correct, well done! Not posting it as it’s the answer.



  135. Steven Miller on January 18, 2012 at 7:44 pm

    unfortunately this doesn’t work — nice try, but you can’t use and as an operation (though I really like this thinking outside the box approach)



  136. Math Genius on January 18, 2012 at 6:29 pm

    5+2=4 and 3



  137. Steven Miller on January 15, 2012 at 1:39 am

    glad you’re enjoying the site. We’re working on a student/teacher’s corner with more info on how to attack, solve, connections to modern math. if you and/or your students want to help or get updates, let me know.



  138. Tina on January 14, 2012 at 7:51 pm

    please send me the answer. I’m a sub and this would be great as a filler. I can’t for the life of me figure it out! ๐Ÿ˜›



  139. Steven Miller on January 13, 2012 at 4:22 pm

    Sure. I’m also hoping to get a student / teacher page with connections to higher mathematics, comments on how to attack problems, …. If you and your students are interested in helping our updates, let me know ([email protected]). //s



  140. Aju M on January 13, 2012 at 2:35 pm

    May I please have the answer for my Math class?



  141. Steven Miller on January 11, 2012 at 4:55 pm

    Sure — let me know how the math night goes. //s



  142. Biana on January 11, 2012 at 3:46 pm

    i would like to use this for a math family night, i cant figure out the answer help!!!



  143. Steven Miller on January 11, 2012 at 7:10 am

    J-crew: correct, not posting as it’s the soln. well done.



  144. doron on January 5, 2012 at 2:21 pm

    Hi steven can you please email me the answer.



  145. Steven Miller on December 22, 2011 at 9:50 pm

    sure //s



  146. Karen on December 21, 2011 at 5:43 pm

    can i have the answer emailed please?



  147. Steven Miller on December 15, 2011 at 3:01 am

    Lance: correct — not posting as it’s the soln



  148. Steven Miller on December 14, 2011 at 3:58 am

    those are just their names, P = Product and S = Sum; this is designed to make it easy to remember.



  149. Anonymous on December 13, 2011 at 10:30 pm

    What does P and S have to do with? That just confused me!



  150. Steven Miller on December 13, 2011 at 8:53 pm

    Not deleting as this time you’re in error. The problem is that you use TWO addition signs, and you only have one.



  151. Anonymous on December 13, 2011 at 8:46 pm

    2+5=3+4
    delete commnet after youve read it



  152. Steven Miller on December 6, 2011 at 2:47 pm

    Kiana and Lane: correct, well done! Not posting as it’s the soln.



  153. Steven Miller on December 1, 2011 at 2:00 am

    kareem: correct! not posting as it’s the soln



  154. Steven Miller on November 30, 2011 at 6:15 pm

    Author : I. Singh (IP: 59.178.33.95 , triband-del-59.178.33.95.bol.net.in): correct — not posting as it’s the soln



  155. Steven Miller on November 26, 2011 at 1:55 am

    I tried but the email bounced — please email me at [email protected]



  156. japie on November 25, 2011 at 7:24 am

    Can you email mail me the answer please?!!



  157. Steven Miller on November 24, 2011 at 1:46 am

    Bryan: correct! not posting as it’s the soln



  158. Steven Miller on November 12, 2011 at 12:52 pm

    Eva: correct, well done — not posting as it’s the soln



  159. Steven Miller on November 10, 2011 at 8:27 pm

    sure — sending the soln //s



  160. Joe on November 10, 2011 at 3:41 pm

    I can’t figure it out..please help



  161. Steven Miller on November 7, 2011 at 2:27 pm

    sure – hint emailed: try just 2 couples, then just 3 couples. look for a pattern



  162. Steven Miller on November 7, 2011 at 2:26 pm

    sure — hint emailed



  163. Mikayla on November 7, 2011 at 9:22 am

    I need help PLEASE!



  164. Mikayla on November 7, 2011 at 9:21 am

    I have no clue! Answer please? ๐Ÿ™‚



  165. Steven Miller on October 30, 2011 at 12:28 pm

    Can’t use a minus sign, only have = and +



  166. Anonymous on October 30, 2011 at 6:32 am

    5-4=3-2



  167. Steven Miller on October 28, 2011 at 2:28 am

    unfortunately this isn’t the answer, as we don’t have two plus signs,only one.



  168. Kendy on October 28, 2011 at 2:06 am

    2+5=3+4



  169. Steven Miller on October 5, 2011 at 1:51 am

    To whomever Submitted on 2011/10/04 at 1:12 am: correct!



  170. olivia on October 4, 2011 at 1:12 am

    4+5=3 to the 2nd power



  171. Steven Miller on September 23, 2011 at 1:52 pm

    To whomever posted at Submitted on 2011/09/23 at 11:52 am — correct!



  172. Steven Miller on September 13, 2011 at 12:28 am

    To: jackfrom341
    137.165.171.182
    Submitted on 2011/09/12 at 9:50 pm
    Correct soln!



  173. Steven Miller on September 6, 2011 at 2:04 pm

    Have to use all the numbers — will email you the soln.



  174. Bonrollen on September 6, 2011 at 12:03 pm

    2+3=5
    Forget number 4 ๐Ÿ™‚
    please give answer ๐Ÿ™‚



  175. Steven Miller on September 2, 2011 at 2:12 am

    Sure — I’ll email you now. //s



  176. Steven Miller on September 2, 2011 at 2:10 am

    Whomever posted at 4.30pm: correct!



  177. Steven Miller on September 2, 2011 at 2:10 am

    Whomever posted at 5.06pm: correct!



  178. Debbie on September 1, 2011 at 4:21 pm

    Can you please provide a better hint to get started? Four of us can’t figure where to get started with only and it’s bugging us! We are trying to think out of the box, but seem limited in our options.



  179. Steven Miller on August 19, 2011 at 3:31 am

    yes — only have one plus sign



  180. Linh on August 19, 2011 at 2:04 am

    2+5=3+4
    Really? Did I got tricked somewhere. It seems too easy to be true.



  181. Steven Miller on July 27, 2011 at 4:51 am

    not quite; isn’t 4 squared 16?



  182. jojo on July 27, 2011 at 4:38 am

    4 squared = 3+5



  183. Steven Miller on July 8, 2011 at 1:32 am

    Sure, as long as you provide links that’s fine. //s



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  185. Steven Miller on July 7, 2011 at 5:59 pm

    Correct solution to this problem — not posting as it shows the answer



  186. Steven Miller on July 6, 2011 at 1:25 am

    Correct post earlier today — I’m not showing it here as it is the right answer.



  187. Steven Miller on June 26, 2011 at 2:25 am

    To “d” who anonymously posted on 2011/05/27 at 12:56 am
    Correct solution, well done; I’m not posting as it’s the answer.



  188. Steven Miller on June 1, 2011 at 4:05 pm

    If you want a hint let me know: sjm1 AT williams.edu



  189. Habeeba on June 1, 2011 at 1:18 pm

    i cudnt do it !



  190. Steven Miller on May 26, 2011 at 4:38 am

    To the anonymous poster (Lori?): your solution is correct; I don’t want to display your post as that would give it away to those still thinking about this. //s



  191. Steven Miller on May 18, 2011 at 1:19 am

    I’ll email you a hint on the bridge problem. 2 to the 4th power is 16, which isn’t 5+3. You’re on the right track though.



  192. Tera on May 17, 2011 at 7:14 pm

    5+3=2 to the 4th power?

    Can’t figure out the 4 men crossing the bridge?



  193. Kelly on May 15, 2011 at 5:14 pm

    I’m a math teacher and would love to share this with my kids. What is the answer!?



  194. Steven Miller on May 11, 2011 at 3:47 pm

    Sadly, it isn’t 2+5 = 4+3; you don’t have two + signs, only one



  195. AK on May 10, 2011 at 6:08 pm

    2+5=4+3



  196. Steven Miller on May 9, 2011 at 1:36 am

    To the person who just tried to post (Sara?): your answer was correct, but I don’t want to post it as that would give away the answer to anyone who comes here.



  197. Steven Miller on April 29, 2011 at 1:40 am

    I apologize for not posting the response by unknown; it contained the correct answer and I prefer not to have those posted here so people can enjoy the riddle.



  198. Steven Miller on April 29, 2011 at 1:38 am

    All the riddles on the page SHOULD be solvable — if not I apologize!



  199. mista p on April 28, 2011 at 9:30 pm

    it is possible!!!!!!!!!!boooooyyaaaaaa in yo face



  200. Steven Miller on April 15, 2011 at 3:58 am

    No, as you’ve written a multiplication in, and you’re not supposed to have any symbol other than = or +



  201. Jordan Ladd on April 14, 2011 at 9:09 pm

    (2)(4)=3+5?



  202. Steven Miller on April 13, 2011 at 6:47 pm

    This should be reclassified as medium. For a hint: try thinking about what numbers P and S would know. For example, if the product is 6 or 10 or 14 or 77, P immediately knows it. Why?



  203. James on April 13, 2011 at 6:00 pm

    If this is easy than I need to do more math workouts!



  204. Jennifer Gossels on August 18, 2010 at 1:21 pm

    This is an example of a comment a visitor could leave about a riddle. Site users can collaborate toward solutions in this comments section.



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