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65 - 57 = 91

Not sure how to make this correct by only moving one matchstick.

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    $\begingroup$ Welcome to Puzzling, take our tour! Could you please provide proper attribution for this question? $\endgroup$
    – Auribouros
    Apr 29, 2022 at 9:13

2 Answers 2

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You need to:

Move the 7's top matchstick down to make a sort of mirrored L, then turn the whole thing upside down, and you get 16 = 75 - 59, which is correct!

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You can

move the lower half of the 1 to the left 5 to make a 6:
66-57=91

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    $\begingroup$ wow. +1. now THAT is thinking outside the box. I love it! $\endgroup$
    – JLee
    Apr 29, 2022 at 18:34