Uncanny Addition












4












$begingroup$


  ? ?

+   ?

-----

    ?


Replace every question mark (?) in this addition with a single digit so that the addition is valid and correct. The first (leftmost) question mark in the first (upper) line cannot be zero (0).



Credit:




(2000@G4G) Jaime Poniachik (1943–2011)







mathematics lateral-thinking







share|improve this question











$endgroup$












  • $begingroup$
    Are rot13(artngvir qvtvgf) allowed?
    $endgroup$
    – Rand al'Thor
    Jan 29 at 9:09










  • $begingroup$
    @Randal'Thor No, they are not
    $endgroup$
    – yunzen
    Jan 29 at 9:09
















4












$begingroup$


  ? ?

+   ?

-----

    ?


Replace every question mark (?) in this addition with a single digit so that the addition is valid and correct. The first (leftmost) question mark in the first (upper) line cannot be zero (0).



Credit:




(2000@G4G) Jaime Poniachik (1943–2011)







mathematics lateral-thinking







share|improve this question











$endgroup$












  • $begingroup$
    Are rot13(artngvir qvtvgf) allowed?
    $endgroup$
    – Rand al'Thor
    Jan 29 at 9:09










  • $begingroup$
    @Randal'Thor No, they are not
    $endgroup$
    – yunzen
    Jan 29 at 9:09














4












4








4


1



$begingroup$


  ? ?

+   ?

-----

    ?


Replace every question mark (?) in this addition with a single digit so that the addition is valid and correct. The first (leftmost) question mark in the first (upper) line cannot be zero (0).



Credit:




(2000@G4G) Jaime Poniachik (1943–2011)







mathematics lateral-thinking







share|improve this question











$endgroup$




  ? ?

+   ?

-----

    ?


Replace every question mark (?) in this addition with a single digit so that the addition is valid and correct. The first (leftmost) question mark in the first (upper) line cannot be zero (0).



Credit:




(2000@G4G) Jaime Poniachik (1943–2011)







mathematics lateral-thinking




mathematics lateral-thinking






share|improve this question















share|improve this question













share|improve this question




share|improve this question








edited Feb 6 at 20:00









Glorfindel

14.3k45286




14.3k45286










asked Jan 29 at 8:41









yunzenyunzen

44111




44111












  • $begingroup$
    Are rot13(artngvir qvtvgf) allowed?
    $endgroup$
    – Rand al'Thor
    Jan 29 at 9:09










  • $begingroup$
    @Randal'Thor No, they are not
    $endgroup$
    – yunzen
    Jan 29 at 9:09


















  • $begingroup$
    Are rot13(artngvir qvtvgf) allowed?
    $endgroup$
    – Rand al'Thor
    Jan 29 at 9:09










  • $begingroup$
    @Randal'Thor No, they are not
    $endgroup$
    – yunzen
    Jan 29 at 9:09
















$begingroup$
Are rot13(artngvir qvtvgf) allowed?
$endgroup$
– Rand al'Thor
Jan 29 at 9:09




$begingroup$
Are rot13(artngvir qvtvgf) allowed?
$endgroup$
– Rand al'Thor
Jan 29 at 9:09












$begingroup$
@Randal'Thor No, they are not
$endgroup$
– yunzen
Jan 29 at 9:09




$begingroup$
@Randal'Thor No, they are not
$endgroup$
– yunzen
Jan 29 at 9:09










3 Answers
3






active

oldest

votes


















9












$begingroup$

Following in @jafe's footsteps:







    I V          I X        X C

  +   I        +   I      +   X

 ------   or   -----  or  -----  etc.

      V            X          C






share|improve this answer









$endgroup$





















    6












    $begingroup$

    One possibility would be using




    some other numbering system than Arabic numerals. The word "digit" can be used for other systems as well.




    For example,




    using rod numerals:

    enter image description here







    share|improve this answer











    $endgroup$













    • $begingroup$
      Guvf vf gur evtug nccebnpu. V qba'g xabj, vs ebq ahzrenyf fubhyq pbhag nf n pbeerpg nafjre, ohg vg vf abg gur vagraqrq bar.
      $endgroup$
      – yunzen
      Jan 29 at 9:18



















    2












    $begingroup$


    Mixing bases is the first thing I can think of, e.g.:
    $10_2 + 1_2 = 3_{10}$







    share|improve this answer











    $endgroup$













    • $begingroup$
      Interesting approach. rot13(Ab onfr punatr)
      $endgroup$
      – yunzen
      Jan 29 at 9:01












    Your Answer





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    3 Answers
    3






    active

    oldest

    votes








    3 Answers
    3






    active

    oldest

    votes









    active

    oldest

    votes






    active

    oldest

    votes









    9












    $begingroup$

    Following in @jafe's footsteps:






    
    I V          I X        X C
    
  +   I        +   I      +   X
    
 ------   or   -----  or  -----  etc.
    
      V            X          C






    share|improve this answer









    $endgroup$


















      9












      $begingroup$

      Following in @jafe's footsteps:






      
    I V          I X        X C
      
  +   I        +   I      +   X
      
 ------   or   -----  or  -----  etc.
      
      V            X          C






      share|improve this answer









      $endgroup$
















        9












        9








        9





        $begingroup$

        Following in @jafe's footsteps:






        
    I V          I X        X C
        
  +   I        +   I      +   X
        
 ------   or   -----  or  -----  etc.
        
      V            X          C






        share|improve this answer









        $endgroup$



        Following in @jafe's footsteps:






        
    I V          I X        X C
        
  +   I        +   I      +   X
        
 ------   or   -----  or  -----  etc.
        
      V            X          C







        share|improve this answer












        share|improve this answer



        share|improve this answer










        answered Jan 29 at 9:18









        BassBass

        30.8k472187




        30.8k472187























            6












            $begingroup$

            One possibility would be using




            some other numbering system than Arabic numerals. The word "digit" can be used for other systems as well.




            For example,




            using rod numerals:

            enter image description here







            share|improve this answer











            $endgroup$













            • $begingroup$
              Guvf vf gur evtug nccebnpu. V qba'g xabj, vs ebq ahzrenyf fubhyq pbhag nf n pbeerpg nafjre, ohg vg vf abg gur vagraqrq bar.
              $endgroup$
              – yunzen
              Jan 29 at 9:18
















            6












            $begingroup$

            One possibility would be using




            some other numbering system than Arabic numerals. The word "digit" can be used for other systems as well.




            For example,




            using rod numerals:

            enter image description here







            share|improve this answer











            $endgroup$













            • $begingroup$
              Guvf vf gur evtug nccebnpu. V qba'g xabj, vs ebq ahzrenyf fubhyq pbhag nf n pbeerpg nafjre, ohg vg vf abg gur vagraqrq bar.
              $endgroup$
              – yunzen
              Jan 29 at 9:18














            6












            6








            6





            $begingroup$

            One possibility would be using




            some other numbering system than Arabic numerals. The word "digit" can be used for other systems as well.




            For example,




            using rod numerals:

            enter image description here







            share|improve this answer











            $endgroup$



            One possibility would be using




            some other numbering system than Arabic numerals. The word "digit" can be used for other systems as well.




            For example,




            using rod numerals:

            enter image description here








            share|improve this answer














            share|improve this answer



            share|improve this answer








            edited Jan 29 at 9:23

























            answered Jan 29 at 9:11









            jafejafe

            24.8k472246




            24.8k472246












            • $begingroup$
              Guvf vf gur evtug nccebnpu. V qba'g xabj, vs ebq ahzrenyf fubhyq pbhag nf n pbeerpg nafjre, ohg vg vf abg gur vagraqrq bar.
              $endgroup$
              – yunzen
              Jan 29 at 9:18


















            • $begingroup$
              Guvf vf gur evtug nccebnpu. V qba'g xabj, vs ebq ahzrenyf fubhyq pbhag nf n pbeerpg nafjre, ohg vg vf abg gur vagraqrq bar.
              $endgroup$
              – yunzen
              Jan 29 at 9:18
















            $begingroup$
            Guvf vf gur evtug nccebnpu. V qba'g xabj, vs ebq ahzrenyf fubhyq pbhag nf n pbeerpg nafjre, ohg vg vf abg gur vagraqrq bar.
            $endgroup$
            – yunzen
            Jan 29 at 9:18




            $begingroup$
            Guvf vf gur evtug nccebnpu. V qba'g xabj, vs ebq ahzrenyf fubhyq pbhag nf n pbeerpg nafjre, ohg vg vf abg gur vagraqrq bar.
            $endgroup$
            – yunzen
            Jan 29 at 9:18











            2












            $begingroup$


            Mixing bases is the first thing I can think of, e.g.:
            $10_2 + 1_2 = 3_{10}$







            share|improve this answer











            $endgroup$













            • $begingroup$
              Interesting approach. rot13(Ab onfr punatr)
              $endgroup$
              – yunzen
              Jan 29 at 9:01
















            2












            $begingroup$


            Mixing bases is the first thing I can think of, e.g.:
            $10_2 + 1_2 = 3_{10}$







            share|improve this answer











            $endgroup$













            • $begingroup$
              Interesting approach. rot13(Ab onfr punatr)
              $endgroup$
              – yunzen
              Jan 29 at 9:01














            2












            2








            2





            $begingroup$


            Mixing bases is the first thing I can think of, e.g.:
            $10_2 + 1_2 = 3_{10}$







            share|improve this answer











            $endgroup$




            Mixing bases is the first thing I can think of, e.g.:
            $10_2 + 1_2 = 3_{10}$








            share|improve this answer














            share|improve this answer



            share|improve this answer








            edited Jan 29 at 19:45









            GentlePurpleRain♦

            17.1k569137




            17.1k569137










            answered Jan 29 at 8:49









            AHKieranAHKieran

            5,5591143




            5,5591143












            • $begingroup$
              Interesting approach. rot13(Ab onfr punatr)
              $endgroup$
              – yunzen
              Jan 29 at 9:01


















            • $begingroup$
              Interesting approach. rot13(Ab onfr punatr)
              $endgroup$
              – yunzen
              Jan 29 at 9:01
















            $begingroup$
            Interesting approach. rot13(Ab onfr punatr)
            $endgroup$
            – yunzen
            Jan 29 at 9:01




            $begingroup$
            Interesting approach. rot13(Ab onfr punatr)
            $endgroup$
            – yunzen
            Jan 29 at 9:01


















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