My dad has invented a new puzzle genre called “add a line and fix the typo”, but due to his senility I can’t be 100% sure this was a deliberate effort on his part. Last week he showed me a puzzle and I solved it almost instantly.

The puzzle is shown below: you have to make this equation correct by adding a line and fixing the typo.

Note: I tagged this under "matches" even though the equation doesn't really consist of matchsticks.

enter image description here


2 Answers 2


The line can be added here to create an inequality; I doubt this is the intended solution.

enter image description here

There's a variant of this puzzle in which the solution is 550, where you turn the "5+5" into 545 with the line, but I'm not sure about 500.


Correct solution:

545+5=550, not 500

For those who can't see

545+5=550 (the typo is the first 0 being a 5, not a 0.

  • 1
    $\begingroup$ Correct answer, well done! $\endgroup$
    – happystar
    Commented Nov 6, 2022 at 4:27
  • $\begingroup$ rot13(Lbh pna nyfb ghea gur frpbaq cyhf fvta vagb n sbhe, engure guna gur svefg bar). $\endgroup$
    – Ed Murphy
    Commented Nov 6, 2022 at 5:29
  • $\begingroup$ @EdMurphy, that is indeed the case... $\endgroup$
    – Stevo
    Commented Nov 6, 2022 at 5:37

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