If 123x45 = 1, 22+222=0, 8979:4=5, 56319=2 what could be the solution to 781-32=?

Found it on an maths board and became desperate over time.

  • $\begingroup$ Which maths board? $\endgroup$
    – bobble
    Oct 1, 2023 at 14:14

1 Answer 1


I think that

781-32 = 2


In every equation, we count the number of enclosed regions on the left-hand side to get the answer on the right side. 0,4,6 and 9 each have one enclosed region and 8 has two.

  • $\begingroup$ Oh, wow, and I've been to every realm of math to solve it. Thanks! Is this a popular pattern in puzzles? $\endgroup$
    – Guestos
    Oct 1, 2023 at 13:29
  • $\begingroup$ @Guestos Yep! Here's a similar puzzle posted in 2014, nine years ago... $\endgroup$
    – Stiv
    Oct 1, 2023 at 14:37
  • $\begingroup$ What do you mean by "enclosed region?" (thanks!) $\endgroup$
    Oct 18, 2023 at 17:53

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