14
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As I am wont to do, I got a new calculator the other day. Obviously it needed a few test calculations:

5 + 6 = 11  
22 - 17 = 5
10 + 3 = 13
4 * 6 = 24

OK, so far so good. But there were also a bunch of weird results that I don't understand:

2 * 1 = 10  
9 + 7 = 9
3 - 1 = 3
34 - 8 = 2  

What's going on?

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Your calculator seems to be

replacing the numbers with how many segments they have lit up on a standard 7-segment display, and doing the calculations with those. (For example, "22" has 10 segments and "17" has 5 segments, so "22 - 17" turns into 10 - 5, which is 5.)

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  • 1
    $\begingroup$ He's good! You can't fool Deus! $\endgroup$ – micsthepick May 31 at 1:11
  • $\begingroup$ Exactly right, well done! $\endgroup$ – LogicianWithAHat May 31 at 7:12

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