25
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Move one line and make this true: $357568588-11 = $ ~ $357568584.858...$

No cross through the "=" sign stuff.

Hint:

It can be ANY line

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    $\begingroup$ I'm not sure what you mean by line. Are you referring to any straight line, or any single digit? Like can I move the top of the 7 making it a / and moving the top part elsewhere? $\endgroup$ – Tas Sep 3 '18 at 21:35
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    $\begingroup$ @Tas the question's hint tells you that, and it's been answered. Nicely, the line can keep its shape. $\endgroup$ – Weather Vane Sep 3 '18 at 21:41
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    $\begingroup$ To a mathematician (who is not a topologist), a "line" is always a straight line. You are thinking about a curve. $\endgroup$ – Andreas Rejbrand Sep 4 '18 at 16:59
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    $\begingroup$ @AndreasRejbrand This is interesting. In Brazil, in Math contexts, you rarely refer to that shape as a "line" - instead, you use the name "Reta", which specifically means a straight line. If written in portuguese, this puzzle would be far easier to figure out since your brain wouldn't link the math straight line and the word line immediately. $\endgroup$ – T. Sar - Reinstate Monica Sep 4 '18 at 17:07
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    $\begingroup$ Well, in English this distinction is commonly used. See, for example, en.wikipedia.org/wiki/Line_(geometry) and en.wikipedia.org/wiki/Curve. And en.wikipedia.org/wiki/List_of_curves. $\endgroup$ – Andreas Rejbrand Sep 4 '18 at 17:21
44
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One can move...

the tilde (~) and place it "on top" of the 11 to make the mathematical symbol $\pi$: $357568588−\pi = 357568584.858...$

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  • 2
    $\begingroup$ Correct! Well done! $\endgroup$ – Rohit Jose Sep 4 '18 at 9:09

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