Make the following equation correct by putting an exact same number on both sides of the equation. The final equation must be an "equal to" equation only. No "less than or greater than" allowed.

Starting equation initially reads < = V

  • $\begingroup$ Just to clarify, are we restricted to putting one instance of the number on each side? $\endgroup$
    – hexomino
    Feb 7, 2023 at 13:21
  • $\begingroup$ Same number. For example if you put say 8 somewhere on the left hand side, you must put 8 somewhere on the right hand side. $\endgroup$
    – RogerA
    Feb 7, 2023 at 13:27
  • 1
    $\begingroup$ Would a 'calculation-puzzle' or 'lateral-thinking' tag be appropriate here? (It's not really a traditional 'riddle' type question so I've removed that tag for now...) $\endgroup$
    – Stiv
    Feb 7, 2023 at 13:41
  • $\begingroup$ It is not a calculation but some lateral thinking could work $\endgroup$
    – RogerA
    Feb 7, 2023 at 13:54
  • 4
    $\begingroup$ Now that this has an accepted answer, it looks like it was a "guess what I was thinking" puzzle. The first posted answer is at least as valid as the accepted answer. $\endgroup$
    – fljx
    Feb 7, 2023 at 16:20

3 Answers 3


You could add

II, roman numerals for 2, on each side and get the following:
enter image description here
1k (prefix for thousand) = M (roman numerals for thousand)

  • $\begingroup$ Terng. Vg vf nyfb ahzore 11 $\endgroup$
    – RogerA
    Feb 7, 2023 at 15:36
  • 3
    $\begingroup$ @RogerA Yes. rot13 (V whfg gubhtug gung jbhyq or zber svggvat fvapr gurer ner ab "ung" (nf gurer vf va gur ahzore 1) ba x naq Z) $\endgroup$ Feb 7, 2023 at 15:50

An unconventional solution:

Add V (5) to both sides like this:

>< = v

i.e. X = X in Roman numerals.

  • $\begingroup$ "Gjb ynml i'f " $\endgroup$
    – smci
    Feb 7, 2023 at 23:55
  • $\begingroup$ To me this feels like a more intuitive answer than the accepted one. $\endgroup$
    – QBrute
    Feb 8, 2023 at 19:51

Left hand side is a bit tilted:

enter image description here


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